HABITAT IMPROVEMENT
PROJECT
Fishery Division
OREGON STATE GAME COMMISSION
P. 0. BOX 3503
PORTLAND, OREGON 97208
Reservoir Research
1965 - 1966
Number 22
STATE OF OREGON
OREGON STATE GAME COMMISSION
FISHERY DIVISION
C. J. Campbell, Chief of Operations
FEDERAL AID TO FISH RESTORATION
COMPLETION REPORT
Reservoir Research
PROJECT F-74-R-1
July 1, 1965 to June 30, 1966
By
Richard G. Herrig
District Aquatic Biologist
Reservoir Research
Number 22
TABLE OF CONTENTS
Page
Objective and History Abstract
.
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0 0046090 0
History 000909090 0000000000000000
Objective
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Ochoco Reservoir.
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e
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...... 0.. 0.
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Job 1:
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1
1
1
Prineville ReSerVOir000000900000 000000
Round Butte Reservoir 0
1
3
3
........
Importance of Size and Race of Stocked Rainbow Trout
in Reservoir Production 000000
Rearing Sites . .,........ 0 .........
0
0
6
6
Marking ........ .......... Q00000
Stocking Method 0 6000000 0 0 00060000 006
9
Fish Inventory.......................
9
AnalYSiS0
6
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0 O600 0 00600900900 0
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Round Butte Reservoir .
...... 0
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Summary ................
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Ochoco Reservoir and Tributaries.
0
16
6
.
Prineville Reservoir and Tributaries.
6000
0 00
.
.
00006
.
Job 3:
0
00
0
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Introduction.
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23
31
Limnology, Water Quality, and Productivity
Studies of Reservoirs.
Objective
16
16
.
.
Round Butte Reservoir and Tributaries
Summary 0000 0 0 000 0
13
15
Reservoir Fish Population Inventory
Objective
10
10
Prineville Reservoir
Job 2:
9
0
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TABLE OF CONTENTS (continued)
Page
Ochoco Reservoir......................
.....
Prineville Reservoir .
.
.
.
.
.
38
38
...........
42
Outline map showing location of Round Butte,
Prineville, and Ochoco Reservoirs in Central Oregon.
2
4
Round Butte Reservoir.
.
LIST OF FIGURES
Figure 1
-
Figure 2
-
Outline map showing Ochoco Reservoir .
Figure 3
-
Outline map showing Prineville Reservoir .
Figure 4
-
Outline map showing Round Butte Reservoir
7
Figure 5
-
Marked fish in relation to total checked,
Prineville Reservoir .
12
Rough fish per net,
Ochoco Reservoir, 1959 - 1966
21
Rough fish percentage of total catch in gill nets,
1959 - 1966. .
22
Figure 6
Figure 7
Figure 8
Figure 9
-
-
-
-
Figure 10 -
Figure 11 -
0
0
.
.
..........
Outline map showing Ochoco Reservoir
Tributary System 000Oo0OGOOORgoo
25
Temperature profiles with dissolved oxygen content,
.
Ochoco Reservoir
39
Temperature profiles with dissolved oxygen content,
.
Prineville Reservoir .
40
.....
Temperature profiles with dissolved oxygen content,
Round Butte Reservoir, Metolius Arm ......
Figure 12 -
Figure 13 -
5
.
Temperature profiles with dissolved oxygen content,
Round Butte Reservoir, Deschutes Arm .
Temperature profiles with dissolved oxygen content,
Round Butte Reservoir, Crooked River Arm ,
.
ii
43
44
.
45
LIST OF TABLES
Page
Hatchery liberations of rainbow trout for
Prineville and Round Butte Reservoirs, 1964 - 1966
Table 1
Table 2
-
.
a
Marked fish recoveries, Prineville Reservoir,
1964 - 1966
14
.............
Table 3
-
Gill net inventory, Ochoco Reservoir
17
Table 4
-
Results of gill nets fished in Ochoco Reservoir
after treatment, 1957
19
Table 5
-
Rough fish distribution,
Ochoco Reservoir and Tributaries, 1965. ....
24
Table 6
-
Gill net inventory, Prineville Reservoir
27
Table 7
-
Gill net inventory, Round Butte Reservoir .
32
Table 8
- Water chemistry, Prineville Reservoir,,1963 .
iii
00000
41
Objective and History Abstract
Objective
The objective of the reservoir research project is to gather
and assemble data concerning the game and rough fish populations in
Round Butte, Prineville, and Ochoco Reservoirs to enable efficient management of the fisheries.
Figure 1 portrays the location of the three Central
Oregon impoundments.
The project has been divided into three different jobs, and
these are:
a.
Job 1 - "Importance of size and race of stocked
rainbow trout in reservoir production"
b.
Job 2 - "Reservoir fish population inventory"
c.
Job 3 - "Limnology, water quality and productivity
studies of reservoirs"
History
Ochoco Reservoir
Ochoco Dam was built by private interests in 1918-1921 and was
rehabilitated in 1949 by the U. S. Bureau of Reclamation,
The reservoir
has a surface area of 1,090 acres with a capacity of 46,500 acre feet,
length is approximately 3.5 miles and its width is 0,5 mile.
Its
Primary use
of the reservoir is irrigation.
Ochocb Reservoir has a history of providing good trout fishing
until competition from rough fish requires rehabilitation.
The reservoir
and 450 miles of streams and irrigation laterals were last chemically
treated
in 1957 for removal of crappie and suckers.
The reservoir provided good trout
-N-
PX
0
GS
MADRAS
ROUND BUTTE
RESERI/CYR
8
8 Aides
0
Scale M / /es
Cr
PR/ NE V/ LLE
XROCO RESERVOIR
Crooked
(i)
PRINEVILLE
RISERYO/R
2C
Figure. I.
LOC/IT/0/V OF ROUND BUTTE, PRINEVILLE
AND °CHOC° Rk-SERVO/RS IN CENTR/ziL
01F4-01V
-2-
angling for seven years after treatment and then became out of balance because of floods, excessive drawdown, and rough fish competition.
Ochoco Reservoir is located eight miles east of the town of
Prineville on Ochoco Creek.
(Figure 2)
Prineville Reservoir
Prineville Reservoir, located 14 miles southeast of the town of
Prineville, was filled in 1962.
The reservoir has a surface area of 3,010
acres with a capacity of 153,000 acre feet.
Its length is approximately 12
miles and its width at the widest spot is one mile. (Figure 3)
Primary uses
of the reservoir are irrigation and flood control.
Liquid synergized rotenone was used to chemically treat 90 miles
of the Crooked River above and below Prineville Dam to reduce the rough
fish population.prior,to impounding of water.
with rainbow trout and largemouth bass.
the river above the reservoir.
The reservoir was then stocked
Smallmouth bass were liberated in
There has been an excellent trout fishery
and a minor fishery for brown bullhead and bass in the reservoir.
Primary problems in fish management are the same as at Ochoco
Reservoir; that is, increasing numbers of rough fish and summer drawdown for
irrigation.
Round Butte Reservoir
Round Butte Reservoir, located on the Deschutes River just below
the mouth of the Metolius River, was filled in December, 1964.
The reservoir,
covering 3,997 acres, has a gross storage volume of 535,022 acre feet and
average annual drawdown ranging from 10 to 13 feet.
-3
Water backs up the
figure 2
OCR° CO RESERVOIR
0
t
4
i.
3
W.
/
i
Scale in Miles
/Ph /e
o
k--f
a 1.1
er
LI
A?
d
±
/Mi le
I
Scale in Miles
Bocrl. Ramp
1
49
/4794.1.--e 3.
I:7R VNE-1/a.L.E RES eR VOIR
Metolius River 11 miles, the Deschutes River 9 miles, and the Crooked River
6 miles. (Figure 4)
Unlike Ochoco and Prineville Reservoirs, Round Butte Reservoir
impounds water for power production.
The reservoir in its first three seasons has provided one of the
major trout fisheries in the State of Oregon.
Fishery management includes
analysis of a population of trout, juvenile salmon and steelhead, and a
diversified population of rough fish.
Job 1
Importance of Size and Race of Stocked Rainbow Trout in a Reservoir
Objective
Determine the best strains and size of rainbow trout for stocking
in three Central Oregon reservoirs.
Rearing Sites
Attempts are being made to determine the best strains of rainbow
trout for the three reservoirs through the use of fin-clipping a percentage of
each plant going into Prineville and Round Butte Reservoirs.
Ochoco Reservoir
has been excluded from this section of the study because of an imbalance in
the fish population, low angler use at present, and necessary concentration
of work power at the other reservoirs.
Stocking data and fearing sites from the first of 1964 through
June of 1966 are given in Table 1.
Essentially, two strains of rainbow fingerling have been tested
at the two reservoirs.
These are Oak Springs Hatchery reared fish from fall
rainbow brood stock and Wizard Falls Hatchery reared fish from Willamette
Hatchery spring rainbow brood fish.
-6
The Oak Springs fish are stocked in
7-
250,736
250,424
250,183
249,162
100,062
89,066
200,352
100,299
171,286
205,283
250,010
252,173
250,044
RV
LP
RP
Ad
BV
none
none
none
none
none
LV
RV
LP
Prineville
Prineville
Prineville
Prineville
Prineville
Round Butte
Round Butte
Round Butte
Round Butte
Round Butte
Round Butte
Round Butte
Round Butte
June, 1964
March, 1965
May, 1965
March, 1966
June, 1966
January, 1964
April, 1964
May, 1964
July, 1964
August, 1964
March, 1965
June, 1965
March, 1966
Oak Springs
Roaring River
Willamette
Oak Springs
Oak Springs
Wizard Falls
82
Willamette
Willamette
Wizard Falls
Wizard Falls
Willamette
Wizard Falls
Oak Springs
112 to 120
86 to 120
Oak Springs
Oak Springs
Oak Springs
57
122 to 137
36 to
87
Oak Springs
112 to 115
77 to
Roaring River
Oak Springs
17
55
8.5 to
153
Oak Springs
Willamette
86 to 109
Wizard Falls
Willamette
Wizard Falls
154
Oak Springs
Oak Springs
Egg
Station
Oak Springs
60
Hatchery
Oak Springs
125
50 to
Number
per
Pound
- 20 percent of all fish released were marked, except those released from January 1964 through
August 1964 in Round Butte Reservoir
250,400
LV
Prineville
Number
Liberated
April, 1964
Markt!
Reservoir
Month
and
Year
Hatchery Liberations of Rainbow Trout for
Prineville and Round Butte Reservoirs,
January, 1964-June, 1966
Table 1
March or April at a size ranging from 50 to 122 fish per pound.
has been about 80 fish per pound.
Average size
Wizard Falls fish are stocked in May and
June at a size range of 112 to 154 fish per pound.
Average size has been
about 125 fish per pound.
Marking
A percentage of each group of rainbow trout released in Prineville
Reservoir has been marked by fin-clipping, starting with the 1964 spring plant.
At Round Butte Reservoir, the marking program commenced in 1965.
Table 1
lists the mark used and percentage fin-clipped of each plant.
It is planned to mark 100 percent of each plant starting with the
fall plants of 1966,
Stocking Method
Fish releases at the reservoirs have been accomplished by two methods.
Part of the fish were released directly from the liberation trucks into the
water at various boat ramps, and the remainder were transferred from the trucks
to a planting boat and then spread throughout the reservoir.
No study or significance was placed on the two different liberation
methods.
Fish Inventory
Primary methods of inventory for the different releases of fish have
been mark analysis from creel census and gill net inventory.
Creel data are collected as time permits on the year-around trout
fishery at Prineville Reservoir, and on a trout fishery from late April until
the end of October at Round Butte Reservoir.
Gill net inventories are accomplished at both reservoirs in the spring,
-9
summer and fall, utilizing five graduated mesh, nylon gill nets per sampling
period.
Analysis
Prineville Reservoir
Marked fish returns indicate the Oak Springs fall rainbow have
contributed substantially more to the fishery at Prineville Reservoir than
spring rainbow reared at Wizard Falls Hatchery.
It is apparent that a 20
percent marking program is not sufficient for the time allotted to creel
census.
This is particularly true with the year-around fishery at Prineville
Reservoir,
Oak Springs fall rainbow, marked left ventral and released in April,
In
1964: at 3.75 inches, were observed in the angler catch two months later.
the following two-year period, 308 left ventral marks were observed in a catch
of 3,416 rainbow trout,
By September, 1964, this plant of trout was estimated
to be contributing 95 percent of the total catch, and for the following 12
months these fish contributed in excess of 70 percent of the total trout catch.
Wizard Falls spring rainbow, marked right ventral and released in
June, 1964 at 3.0 inches, did not appear in the creel until the following
May (1965),
Only 13 right ventral marks were observed in the catch over the
next 14 months, and for no monthly period were they calculated to contribute
more than 9 percent of the catch.
Fish released at Prineville Reservoir in 1965 were from the same
hatchery and race as the previous year.
The Oak Springs fish were 3,0 inches
when released in March with the left pectoral fin excised.
These fish did
not appear in the catch as soon after release or contribute as much to the
- 10 -
catch as the Pak Springs fish from the previous year.
The first returns
occurred five months after release and constituted 71 percent of the catch
in January, 1966.
Their contribution to the creel fell sharply, and in June,
1966, they were contributing only 17 percent to the catch.
Only 59 left pec-
toral fish were examined in the catch from August, 1964, through June, 1966.
The Wizard Falls rainbow, marked right pectoral, released in May,
1965 at 2.0 inches in length, also appeared in the catch first in August,
1965 and contributed 35 percent to the catch in January, 1966.
The expanded
mark data totals more than 100 percent and in Figure 5 because of small sample
size in winter months, but does indicate relationship between marks.
The marked fish data collected from creel census, although insufficient in numbers examined, indicate better survival and catch for the Oak
Springs fall rainbow.
In 1964 and 1965 there is no question of the Oak Springs
fish superiority for this body of water; however, the 1965 plants which were
caught in late 1965 and the first six months of 1966 do not show the difference
apparent in the first year's marks.
Further examination of the fishery is
needed to evaluate the 1965 plants.
The various stocks of marked fish in relation to the total rainbow
trout checked are depicted in Figure 5.
Population inventories at Prineville Reservoir with gill nets corroborate the analysis from creel census.
That is, Oak Springs fingerling have
a better survival rate than the fingerling from Wizard Falls.
Five graduated mesh nylon gill nets are set three times a year at
Prineville Reservoir.
The catch of 25 gill nets set from October 1964 through
April, 1966, included 453 rainbow trout.
Marks observed included 40 left ventral,
May
Feb
....... ..........
Jan
O
Sep
Aay
/
// vu
\
Jul
Jun
sl\May
'11
Apr
Mar
b Fe
Jan
Dec
Nov
Ocf
Sep
s //1-9
Auy
Jul
Jan
May
co
t
0
GN
atv
checked rm./76cm/ 740401 074". ce.14 der
-
_z
two right ventrals, 19 left pectorals, and one right pectoral.
In expanding
this data from the 20 percent marking program, it indicates approximately
44 percent of the total trout catch was from the 1964 Oak Springs plant,
21 percent Oak springs 1965 plant, 2 percent Wizard Falls 1964 plant, and
1 percent Wizard Falls 1965 plant.
Growth analysis from mark recoveries of the past two and one-half
years indicates approximately the same pattern for fish from both hatcheries.
The fingerling grow rapidly for the first year and a half into the 12-to
14-inch size group and thereafter growth is slow.
Bimonthly average sizes for the different stocks are given in
Table 2.
Round Butte Reservoir
Mark recoveries at Round Butte Reservoir are too few to draw firm
conclusions on contributions from different strains of rainbow trout.
The
data that has been recovered gives and indication that Oak Springs fingerling
may not show superiority at Round Butte Reservoir as they did at Prineville
Reservoir.
The first marked rainbow to be planted at Round Butte were Oak
Springs Hatchery fall fingerling, marked left ventral, averaging 2.7 inches,
planted in March, 1965.
Seven of these fish were found in a catch of 1,366
rainbow checked from July through October 1965.
This indicates the Oak
Springs fish contributed a minor portion to the catch in the year they were
planted.
Spring rainbow from Wizard Falls Hatchery were 3.0 inches when
planted in June, 1965,
Twenty percent of these fish were marked by a right
- 13 -
April 22, 1964
March 29, 1965
June 3, 1964
May 27, 1965
Oak Springs
LP
fall Rb
Wizard Falls
RV
spring Rb
Wizard Falls
RP
spring Rb
Planting
Date
Oak Springs
LV
fall Rb
SEecits
Mark
2.00
2.75
3.00
3.75
Planting
Size,
Inches
7.2
Jun
7.5
A
1964
7.8
9.2
Oct
9.9
Dec
10.2
Feb
10.3
A r
9.8
11.4
1965
June
Oct
9,1
7.5
8.8
10.3 10.5
7.5
11.3 11.5
A
AVERAGE SIZE_,_ INCHES
Marked Fish Recoveries,
Prineville Reservoir, 1964-1966
Table 2
9.0
10.5
12.2
Feb
1966
10.1
12.1
10.9
12.3
A r
12.6
12.2
12.8
14.4
June
ventral fin clip and none were recovered from creel checks in 1965.
Creel data collected from April 23 to June 30, 1966, included
34 left ventral marks and 33 right ventral marks in a check of 560 rainbow
trout.
Projecting the data by the 20 percent mark program indicates 30.4
percent of the total catch was from the Oak Springs fingerling and 28.4
percent from Wizard Falls fingerling.
It would appear from the small
sample both hatcheries are contributing approximately equal to the fishery.
Gill net inventories lend support to the theory there may be
equal survival and contribution from the two strains of rainbow trout.
Five gill nets fished in July, 1965, caught 10 rainbow, of which 1 was
marked left ventral.
At this time the right ventral marked fish were too
small to be captured in the nets.
The gill nets set in December, 1965, took 121 rainbow, of which
4 were left ventral and 2 were right ventral marked.
These were the first
recaptures of right ventral marks.
In March, 1966, the nets took 88 rainbow, and marks were equal,
with 3 of each ventral mark taken.
Summery
The short period covered and limited numbers of marks recovered
precludes defining the best size and race of stocked rainbow trout at this
time.
It is apparent that additional data is necessary to pinpoint optimum
size and race of rainbow fingerling for the various bodies of water.
Prineville Reservoir has yielded better returns for the Oak
Springs fingerling; whereas, returns at Round Butte from the one year's
plants have shown approximately equal©
In considereing size along with race, it is noted that the Oak
Springs fingerling that have given best results at Prineville Reservoir were
- 15 -
larger when stocked than the
Wizard Falls fingerling (Table 1).
At Round
Butte Reservoir, the Wizard Falls fingerling were slightly larger, and the
The implication would
contribution from each hatchery approximately equal.
then be that size at time of stocking is more important than race for these
two reservoirs.
Job 2
Reservoir Fish Population Inventory
Objective
Determine the relationship of game fish to the undesirable
species and the effect on the sport fishing resource.
Ochoco Reservoir and Tributaries
Fisheries data collected at Ochoco Reservoir since the late 1940's
indicates two major factors influencing the success Of the trout fishery.
These factors are: (1) the degree of annual drawdown for irrigation and,
(2) fluctuations in the rough fish populations.
Ochoco Reservoir was first chemically treated with rotenone in
1949, when gill nets indicated the population was near 100 percent rough
fish.
Angler success was good for several years after the treatment but the
increasing numbers of coarse fish made it necessary to chemically treat the
reservoir in 1957.
Two years after the initial rehabilitation project in
1949, rough fish comprised 71 percent of the gill net samples.
The primary
rough fish species were suckers (Catostomus) and a few squawfish (Ptychocheilus).
Inventory by gill net showed a continued increase of rough fish, and, in
1956 the catch was 95 percent undesirable species.
A history of composition
and length frequency data collected with gill nets is presented in Table 3.
-
16 -
October 21,
1960
1959
October 21,
April 7,
1959
1958
October 5,
1956
October 5,
October 5,
1954
1951
October 5,
Date
Rainbow
Sucker
Rainbow
Sucker
Rainbow
Sucker
Rainbow
Sucker
Rainbow
Black crappie
Sucker
Squawfish
Rainbow
Black crappie
Sucker
Squawfish
Rainbow
Sucker
Squawfish
Species
4
1
4
2
4
4
140
62
23
35
3
254
9
2
5
150
1
6
1
219
5
12
1
39
93
Number
of
Number
Sets Taken
35.0
15.5
23.0
35.0
63.5
0.7
4.5
1.0
1.5
0.2
37.5
1.2
2.5
1.2
54.8
0.2
9.7
23.2
0.2
Fish
per
Net
69.0
31.0
40.0
60.0
99.0
1.0
82.0
18.0
4.0
1.0
92.0
3.0
5.0
2.0
92.0
1.0
29.0
70.0
1.0
2
1
5
3
5
7
1
1
5
1
26
7
2
2
9
1
4 14 26 18
3
1
2
5
1
44 70 94
1
1
16 16
3
6
1
13 44 61
1
6
7
8
6
7
35
1
15
2
4
10
13
8
6
4
1
42
11
4
2
9
1
15
12
1
13
13
17
14
Number in one-inch size groups
3 27
8 13
6
2 34 66 13
1
Percentage of
Total 1
Gill Net Inventory, Ochoco Reservoir
Table 3
13
15
2
16
2
17
and
Over
18
Rainbow
Sucker
Rainbow
Sucker
Rainbow
Sucker
October 7-,
April 14,
1966
June 29,
1966
co
La
1965
81
73
45
60
163
142
L
84
24
Li
580
158
47
76
167
30
230
110
4
58
18.2
20.2
15.0
11.2
40.7
35.5
21.0
6.0
145.0
39.5
11.8
19.0
41.8
7.5
57.5
27.5
1.3
19.3
Fish
per
Net
47.4
52.6
42.9
57.1
53.4
46.6
77.8
22.2
78.6
21.4
38.2
61.8
84.8
15.2
67.6
32.4
6.5
93.5
6
1
16 rainbow not measured.
5
5
4
7 11
9
6 37 95
2 11 12
9
1
20 31
1
2
16 20 30 25
8
2
8
5
12 30
2
3 10
19 19 1
6
4
9
9 83 62
4
7
4
20 23
2120
1 67
4 16
96
3
4
3
1
1
2
1
4
9 14
2
12
6
2
1
5
7 10
7
9
2
1
13 12
4
2
1
11
6
2
10
8
4
1
9
11
5
2
8
6
6
7
2 13 91 98
6 33
5
14
5
3
14
1
2
3
1
7
12
10
2
6
2
13
9
3
1
1
1
2
2
2
14
4
1
2
15
Number in one-inch size groups
1 45112 11 18 25
Percentage of
Total
4
353 rainbow under 8 inches not included in size group., by inches.
4
4
4
4
Rainbow
Sucker
1965
March 15,
4
4
4
3
Sets Taken
4
Rainbow
Sucker
Rainbow
Sucker
Rainbow
Sucker
Rainbow
Sucker
Species
Rainbow
Sucker
September 29,
1964
March 11,
1964
March 15,
1963
October 9,
1962
April 2,
1962
Date
Number
of
Number
Gill Net Inventory, Ochoco Reservoir
Table 3 (continued)
2
1
16
1
17
and
over
18
In 1957, the reservoir and approximately 450 miles of tributary
streams, irrigation laterals, and marsh areas were treated with rotenone.
Millions of rough fish were eliminated.
Suckers, squawfish, goldfish,
sculpin, and rainbow trout were found in the tributary system.
prised about 97 percent of the fish killed.
Suckers com-
The reservoir yielded many
thousands of suckers, crappie, and bullhead catfish.
Few trout were observed.
The catch of fish by gill nets immediately after treatment of the
reservoir may be found in Table 4.
Table 4
Results of Gill Nets Fished In
Ochoco Reservoir After Treatment, 1957
Number
of
gill nets
Date
Set
September 16
6
Duration Number and
species
of set,
caught
(hours)
24
Location of set
(feet)
crappie
sucker
Lower and middle
section of reservoir
35 to 70
2 suckers
Lower and middle
section of reservoir
35 to 70
Upper reservoir
15 to 30
Middle reservoir
35 to 45
1
1
September 27
6
72
Depth
of set
October 1
2
48
none
October 3
2
96
1
sucker
The five fish caught in gill nets in the twelve-day period were in
45 feet of water in the same areas of the reservoir--possibly a spring area.
The fishery after treatment in 1957 provided extended periods of
exceptional angling.
Up to 1964, the fishery was good except for periods when
excessive irrigation drawdown limited the winter pool and required a reduction
- 19 -
in the rainbow fingerling stocking program.
Low summer and fall water levels in 1964 limited the growth of
rainbow fingerling.
In late September, 1964, a gill net sample of the reservoir
took 145 rainbow trout per net set (Table 3); however, more than 85 percent of
In late winter of 1964, a severe flood
the fish were less than 8 inches long.
filled the reservoir and was responsible for keeping the reservoir muddy through
the entire year of 1965.
In essence, several factors have lead to poor fishing at Ochoco Reservoir over the past three years.
These include low winter pool level, flooding,
extremely muddy water, all contributing to the poor growth and overall condition of the trout.
Competition from rough fish has undoubtedly played a part in
reducing the trout growth; however, it seems likely that had other factors been
favorable there could have been a good trout fishery.
Gill net samples collected since the 1957 chemical treatment project
do not reveal a rapid buildup in the rough fish population.
Figure 6 depicts the rough fish taken per net since 1959.
Figure 7 gives the percentage of rough fish compared to the total
gill net catch since 1959.
The two species of fish taken during the reservoir population inventories are rainbow trout and suckers,
by net or reported by anglers.
No crappie or squawfish have been caught
Bullhead catfish have been reported by anglers,
however, their presence has not been verified by creel census or net inventories.
The watershed above Ochoco Reservoir was examined in the summer of
1965 to determine the extent of rough fish reinfestation.
(Pro-Noxfish) was used in sampling.
Use of rotenone
Suckers were found extending well up
- 20-
Year
/959 -1966
ROUGH FISH PER NET, Ociioco R.ESERVO/R
/5-9z/re
0
/0-
20-
30
40
50
0
ST..1
rectr-
in
IN GILL NETS, /959-1966, OcNoco REsoFvoiR
ROUGH FISH PERCENTAGE OF TOTAL CRTC,/
Eisfure 7
into the watershed on the major tributaries.
Most of the small feeder
tributaries were dry at the time of survey.
Upper limits of rough fish infestation are given in Table 5 and
depicted on the map, Figure 8.
Prineville Reservoir and Tributaries
Impounding of water in Prineville Reservoir commenced on December 12,
1960.
Prior to storage of water, 91 miles of Crooked River and tributaries
above the dam site were chemically treated to remove large populations of
suckers, chiselmouth, squawfish, and bullhead catfish.
Although no attempt
was made to remove all of the rough fish from the watershed above the reservoir, the population was substantially reduced and provided for good trout
growth.
Total stocking for the first year (1961) was over 500,000 finger-
ling, and by mid-August and early September the reservoir was contributing
outstanding catches of 10 to 12-inch rainbow.
In 1963, estimates of visitor and fisherman days, catch, and
numbers of vehicles, were computed from operation of two car counters by
the Oregon State Game Commission, one counter by the State Parks Department,
periodic car counts, and individual interviews by Commission personnel to
establish ratios
of angling in relation to other uses; of boat and house
trailers; of anglers per car; and average length of stay.
for 125,000 angler-days was computed to be 253,000 fish.
The sport catch
This catch in-
cluded 77 percent rainbow trout, 4 percent black bass, and 19 percent
brow bullhead catfish.
These computations have been determined each year since 1963,
23
Table 5
Rough Fish Distribution,
Ochoco Reservoir Tributaries, 1965
Stream
Mill Creek
Miles
Infested
12.0
Remarks
Up to forks
Mill Creek
(East Fork)
2.0
Mill Creek
(West Fork)
Unnamed tributary
(Mill Creek)
0.5
1.0
First east tributary
past Steins pillar.
Ochoco Creek
18.0
To confluence of
Canyon Creek
Polly Creek
(Ochoco Creek)
None
Mostly dry, none in
potholes.
Veazie Creek
(Ochoco Creek)
0.2
Wolf Creek
3.5
Cadle Creek
(Wolf Creek)
0.5
Marks Creek
(Ochoco Creek) Ll
18.0
To confluence of
Crystal Creek.
Ll All tributaries of Marks Creek not sampled; however, most were dry
in the summer of 1965.
Scale in Wee
0
3 mil*.
TRIBUTARY SYSTEM
OCHOCO RESERVOIR
Figure 8,
Its sermioliorsi.
Upsfrectrpi ingt/s
of rousfit rish fooPrd
with the 1964 estimates calculated at 146,000 angler days and 400,000 fish
caught.
For 1965 the estimate was 134,000 angler days and 262,000 fish
caught.
In 1964 rainbow trout comprised 85 percent of the catch, and in
1965 trout contributed 82 percent of the catch.
The reduced catch in 1965
is a direct result of the extremely turbid water conditions throughout the
season.
The muddy water entered the impoundment from the December 1964
flood.
A history of catch composition and length frequency data collected
by gill nets at Prineville Reservoir are
numbers have increased each year.
given in Table 6.
Rough fish
The increase was slow the first three
years, ranging from 4.0 percent of the total catch in 1961 to 5.0 percent
in 1963.
After 1963 the incidence of coarse fish was 18.0 percent in 1964
and 35.3 percent in 1965.
The 1966 data would not be available until the
end of the year.
The number of rough fish per net shows about the same trend as
the percentage of fish obtained in the total catch.
The rough fish per
net figure has increased from 0.5 fish in 1961 to 11.3 fish in 1965.
Numbers of game fish for the period 1961 to 1965 have fluctuated
and show no
general pattern.
There is no indication of a decreased in the
face of increasing numbers of rough fish.
per net): 1961, 11 fish;
fish; and 1965, 19.9 fish.
few nets were set.
1962, 50.8 fish;
These figures are (in game fish
1963, 15.7 fish;
1964, 26.4
The 1961-1962 figures are less reliable because
In 1961, only two nets were set, and in 1962 only five
nets were used.
The tributary system above Prineville Reservoir has produced good
- 26 -
rainbow
squawfish
rainbow
brown bullhead
largemouth bass
squawfish
chiselmouth
rainbow
brown bullhead
squawfish
rainbow
brown bullhead
largemouth bass
smallmouth bass
sucker
sqauwfish
rainbow
5
smallmouth bass
sucker
rainbow
brown bullhead
sucker
1961
1962
March 8,
1963
July 16,
1963
August 22,
1963
December 7,
1963
5
5
5
5
2
Species
Date
2
3
102
1
1
9
4
8
5
10
6
15
2
5
158
3
10
1
123
130
1
22
Number
Number
of
Taken
Sets
20.4
0.6
0.4
81.8
1.8
0.2
0.2
95.3
2.8
1,9
9.1
9.1
31.3
12.5
20.8
10.4
16.7
8.3
95.8
3.0
1.2
3.0
1.2
2.0
1.0
1.6
0.8
31.6
1.0
0.4
1.1
3.7
48.7
0.4
46.1
96,0
4.0
11.0
0.5
24,6
26.0
0.2
2.0
0.6
Percentage of
Total
Fish
per
Net
8
1
1
1
1
5
1
4
1
2
3
6
4
2
1
4
1
23
1
1
3
3
4
1
4
1
1
6
2
55
1
1
3
2
1
45
4 10
4
7 28 17
3
2
1
2
3
2
9
1
25
1
11
61
1
3
10
21
4
9
34
5
5
8
8 14 38
5
7
1
13
1
2
1
1
37
34
12
1
7
1
1
3
3
13
2
2
14
1
Number in one-inch size groups
Prineville Reservoir
Gill net catch and Composition data,
1961 - 1966
Table 6
16
17
"
18
Over
and
rainbow
brown bullhead
sucker
rainbow
5
brown bullhead
largemouth bass
smallmouth bass
sucker
squawfish
rainbow
brown bullhead
largemouth bass
sucker
squawfish
rainbow
brown bullhead
largemouth bass
sucker
squawfish
rainbow
5
brown bullhead
largemouth bass
smallmouth bass
sucker
squawfish
March 16,
1964
July 16,
1964
October 15,
1964
May 18,
1965
August 2,
1965
5
5
5
Species
Date
3.8
2.8
0.2
8.0
5.0
40
73
16
3
9
3
4
21
12
7
83
4
3.7
2.8
8.3
2.8
67.6
14.8
0.8
0.6
1.8
0.6
14.6
3.2
65.4
8.5
4.0
3.2
5.5
9.4
16.5
1.4
7
1
15
68.2
18.8
0.5
30.8
13.3
9.8
0.7
27.9
17.5
98.8
0.6
0.6
3
1
1
1
Percentage of
Total
5
16.6
0.8
1.4
2.4
4.2
24.0
6.6
0.2
3.0
33
120
25
1
8.8
19
14
32.6
0.2
0.2
Fish
per
Net
44
1
1
163
Number
of
Number
Sets
Taken
1
1
4
1
1
1
8
9
1
1
4
2
8
5
1
6
5
1
2
24
1
3
2
1
3
5
2 11
49
2 12
2
4
1
1
2
2
2
3
9
3
5
5
3
6
4 12
1
3
4
4
4
37
10
4 30 49
2
5
7
5
1
8 15 46
7
3 14
4
6
2
1
1
3
3
1
8
1
11
1
8
2
3
1
7
10
4
1
1
11
1
7
2
5
14
1
1
1
7
17
1
10
2
1
22
13
1
1
3
7
7
2
3
12
14
12
6
12
11
6
1
1
1
15
Number in one-inch size groups
Prineville Reservoir,
Gill net catch and Composition data
1961 - 1966
Table 6 (continued)
3
2
1
16
1
17
18
and
Over
rainbow
brown bullhead
largemouth bass
sucker
squawfish
rainbow
brown trout
largemouth bass
sucker
squawfish
chiselmouth
October 13,
April 5,
1966
1965
Species
Date
5
5
2
57
17
1
4
11.4
3.4
0.4
1
-2.2
9.1
1.1
0.6
31.0
1
56.0
20.6
0.8
0.2
103
1
1
1
1
1
1
5
13
40
6
1
5
1
1
4
6
10
7
5
7
7 21
6
2
7
2
3
5.7
12.5
1
9
8
43
4
38
15
11
1
1
1
4
1
3
10
1
2
1
1
5
8
13
2
2
5
19
12
1
1
14
1
1
1
15
1
16
Number in one-inch size groups
25 44
8
2.6
5.6
1
7
2
1
6
13
28
28.6
5
63.2
17.7
0.9
Percentage of
Total
Fish
per
Net
8.0
0.4
143
40
Number
of
Number
Sets
Taken
Prineville Reservoir,
Gill net catch and Composition data
1961 - 1966
Table 6 (continued)
17
18
Over
and
trout fishing in a few areas since it was chemically treated; however,
much of the adjoining land is closed to fishing by the posting of private
property against entry.
With the exception of higher tributaries in the
National Forest, development of a major fishery on the upper Crooked River
poses several problems.
Since the chemical treatment in 1960, the rough
fish population, comprised of suckers, squawfish, and chiselmouth, has
increased and now forms a major segment of the fishery.
Most of the stream
flow is diverted for irrigation purposes in the summer.
A survey to define
the composition of the fish population present will begin in the late summer
of 1966.
There is a substantial population of smallmouth bass and bullhead
catfish in the stream, and these may provide the future fishery for the
river.
Prineville Reservoir has been directly responsible for development of a substantial quality trout fishery in the Crooked River immediately below Prineville Dam.
Prior to construction of the dam, this section
of Crooked River was too warm for trout and supported a tremendous populatioh of rough fish.
The rough fish from Prineville Dam, down to a
small concrete irrigation dam (Stearns Dam), some 14 miles downstream were
eliminated during the 1960 rehabilitation project.
Cool waters diverted
from the bottom of the reservoir have provided an excellent habitat for
trout during the summer irrigation season.
The Crooked River below Prineville Dam is now one of the few
stream areas in Oregon where it is economically justifiable to plant fingerling rainbow trout and expect good returns to the creel.
Marked rainbow
trout from Wizard Falls Hatchery were stocked in a 14-mile section from
Stearns Dam to Prineville Dam June 15, 1965.
- 30 -
These fish, averaging 117 per
pound when stocked, were averaging 9.5 inches when the season closed
October 31.
In April, 1966, fish 15 inches in length were creeled, with
this stock of fish averaging 12 inches.
Average monthly maximum water temperatures recorded on a thermograph 400 yards below Prineville Dam ranged from 42.0° F. in April, 1965,
to 52.8° F. in September, 1965.
Another thermograph, approximately 42
miles downstream revealed average monthly temperatures ranging from 47.0° F.
in April, 1965, to a high in July of 69.8° F.
Following the 1960 chemical treatment project, no rough fish were
found in the stretch of Crooked River from Prineville Dam to Stearns Dam
(14 miles) until the summer of 1965, when two suckers were taken by anglers.
The reinfestation may have occurred when the spillway was used for the
first time during the flood in the winter of 1964.
Round Butte Reservoir and Tributaries
Round Butte Reservoir began filling in January, 1964, and reached
maximum storage during the flood peak in December, 1964.
Anglers commenced fishing the reservoir on April 24, 1964, when
the trout season opened.
The catch consisted of small planted rainbow,
native rainbow, steelhead smolts, chinook smolts, and a few Dolly Varden
and brown trout.
In the first year of impoundment, 25 gill net sets were made and
the catch yielded a total of 1,289 fish.
Average fish per net was 47.7, and
rough fish comprised 44.4 percent of the total.
Composition and length frequency data collected with gill nets is
presented in Table 7.
- 31
-
rainbow
Dolly Varden
whitefish
sucker
squawfish
chiselmouth
rainbow
Dolly Varden
brown trout
whitefish
sucker
squawfish
chiselmouth
8
rainbow
Dolly Varden
brown trout
smallmouth bass
whitefish
sucker
squawfish
chiselmouth
cottid
January 29,
1964
April 1,
1964
July 24,
1964
4
5
Species
Date
of
Sets
Number
1.1
0.1
9
1
11
198
0.3
24.8
1.4
0.1
0.1
0.1
9.8
2
1
1
1
78
27
4
4
1.0
40.0
6.8
160
1
2
5.0
0.5
0.3
1.0
5.2
1.0
1.4
14.8
1.0
0.8
20
4
5
74
7
5
26
Number
Taken
0.3
3.7
3.0
25.8
0.3
0.3
0.3
0.7
65.6
9.2
0.9
0.5
1.8
73.4
12.4
1.8
3.3
4.1
5.8
61.2
4.1
21.5
1
3
1
Fish Percentper age of
Net Total 5
1
1
10
5
1
2
1
3
6
1
1
4
2
1
24
1
1
3
45
19
1
6
22
12
2
1
2
33
1
2
17
2
1
2
1
17
1
28
13
3
1
8
5
1
1
1
1
2
1
6
12
1
11
10
16
3
4
5
2
2
19
3
7
1
4
1
1
9
9
13
12
1
4
5
8
1
4
7
8
12
1
46
22
1
13
13
29
11
14
16
4
1
3
15
Number in one-inch size _groups
Round Butte Reservoir
Gill net catch and Composition data
1964 - 1966
Table 7
7
1
6
5
16
4
1
1
17
1
1
1
and
Over
18
Species
rainbow
Dolly Varden
brown trout
whitefish
coho
chinook
sucker
squawfish
chiselmouth
cottid
rainbow
Dolly Varden
whitefish
coho
chinook
sucker
rainbow
brown trout
whitefish
sucker
squawfish
chiselmouth
goldfish
Date
October 9,
1964
January 25,
1965
July 28,
1965
5
8
1
27
335
23
1
1
10
2
5
44
2
2
203
3
6
21
142
39
49
23
1
27
5.9
6.5
0.3
2
1
7
2
3
11
38
1
3
32
8
26
1
7
1
8
4
8
60
14
8
13
3
3
6
70
1
7
2
8
2
2
7
1
4
1
5
1
1
10
1
3
20
2
1
3
9
1
1
2
3
2
4
q
2
5
5
11
2
10
146 57
9
7
67
4
8
3
1
53
7
168 83
2.5
0.3
0.3
2.0
0.2
0.2
67.o
4.6
5.4
0.2
6
1
21
99 43
1
6
1
17
1
3
9
5
2
12
3
1
1
1
13
5
1
14
15
Number in one-inch size groups
84.2
78.7
0.8
0.8
17.0
1.9
0.8
3.2
0.9
0.5
6.0
7.6
3.6
21.9
54.o
2.0
0.3
40.6
0.4
0.4
8.8
1.o
0.4
0.8
0.4
6.1
2.6
0.3
2.9
17.8
4.9
1.6
2
43.8
13
Fish Percentper age of
Net Total 5
350
Number
Number
of
Sets
Taken
Round Butte Reservoir,
Gill net catch and Composition data
1964 - 1966
Table 7 (continued)
1
-1
2
16
17
1
1
and
Over
18
Species
1966
March 2,
rainbow
Dolly Varden
whitefish
coho
sucker
December 15, rainbow
Dolly Varden
1965
brown trout
whitefish
coho
chinook
sucker
squawfish
chiselmouth
Date
5
5
of
Sets
Number
4
30
39
7
88
7
1
47
1
4
54
1
121
8
Number
Taken
17.6
1.4
0.8
6.0
7.8
1.6
0.2
0.8
10.8
0.2
9.6
0.2
1.4
24.2
52.4
4.2
2.4
17.8
23.2
0.4
19.2
0.4
2.9
22.1
49.6
3.3
0.4
1.7
Fish Percentper age of
Net Total 5
3
3
3
2
4
3
2
8
5
4
14
3
17
32
20
2
17
20
1
2
1
24
1
10
9
1
12
1
4
4
20
10
1
8
7
2
1
3
6
4
29
1
1
1
1
29
11
2
2
7
4
1
1
7
2
12
4
1
2
13
1
1
3
14
Number in one-inch size groups
Round Butte Reservoir,
Gill net catch and Composition data,
1964 - 1966
Table 7 (continued)
7
1
1
13
4
15
5
1
5
2
16
4
1
3
1
1
17
18
2
2
2
1
1
and
Over
Although the percentage of rough fish taken in gill nets has been
over 40 percent of the total catch since initial impoundment, fingerling
trout plants by the Oregon State Game Commission and fry coho salmon plants
by the Fish Commission of Oregon have made excellent growth and provided
one of the top sport fisheries in the state.
excellent angling in 1965, as it did in 1964.
The reservoir provided
Creel data collected from
2,340 anglers in 1965 show 14,609 fish taken, of which 63.6 percent were
rainbow or steelhead trout, 34.8 percent salmon, and the remaining 1.6
percent consisted of Dolly Varden, brown trout, kokanee, brown bullhead,
and Atlantic salmon.
The catch rate was 1.38 fish per hour in 1965, com-
pared to 0.74 fish per hour in 1964.
The average rate of catch was 6.2
fish, per trip.
Angler success from late April through June of 1966 did not
reveal the exceptional angling experienced the first two years, but was
considered good with 541 anglers roporting a catch of 1,651 game fish at
a rate of 0.60 fish per hour.
Comprehensive chemical treatment of the tributaries above the
Round Butte impoundment site prior to impoundment was not possible because
of the anadromous salmonids that spawn and rear in the area.
An exception
was the Crooked River which was populated with few salmonids and large
numbers of rough fish.
A segment of the Crooked River and sections of Ochoco Creek,
McKay Creek, and Dry River were chemically treated between August 13 and
November
5,
1963.
One reason for treatment was the desirability of sub-
stantially reducing the rough fish population prior to filling Round Butte
Reservoir and giving trout fingerling a better chance of survival.
-35-
A total of 860 gallons of rotenone (Pro-Noxfish) was used to
obtain toxicities up to 2.0 ppm in 87 miles of river and tributary streams.
The fish kill for the entire project listed in order of magnitude of kill
was suckers, whitefish, dace, squawfish, rainbow trout, chiselmouth, brown
bullhead, and goldfish.
It is estimated that suckers comprised 85 to 90
percent of the total kill.
Summary
Determining the relationship between rough fish and game fish and
the resultant effect on the sport fishery for a given body of water is a
complex problem because of the many factors influencing the success of the
fishery.
Ochoco Reservoir should show a more pronounced effect from unde-
sirable fish since it has had a higher percentage drawdown than Prineville
Reservoir and has exhibited, through gill net inventories, an over-population of fish.
Ochoco Reservoir averaged 184 fish per net in September,
1964, and 76 fish per net in October, 1965, compared to 35 fish per net in
October, 1964, and 41 fish per net in October, 1965 for Prineville Reservoir.
Prineville Reservoir is a relatively new reservoir, and, therefore,
should have a higher productivity rate, sustaining a higher percentage of
rough fish in the total population and yet provide a better fishery than
Ochoco Reservoir.
Other factors also play an important part in influencing the
success of a fishery.
Most new reservoirs will initially provide an excellent
fishery, then show a declining tread as the initial food productivity decreases.
Also to be considered in success of the fishery is the strain,
size, and time of release of the fish stocked.
-36-
Round Butte Reservoir provides excellent growth and catch success
from fingerling trout plants, even in the face of a substantial rough fish
population (40 to 50 percent) because it is a new reservoir with a high
food productivity rate, and is not subjected to high annual irrigation
drawdown.
Growth rate and catch success are satisfactory at Prineville
Reservoir, but both are showing signs of decreasing as the numbers of
rough fish increase and productivity goes down.
At Ochoco Reservoir, the sport fishery is adjudged poor and the
Factors causing the poor sport
growth rate is less than satisfactory.
fishery include extreme irrigation drawdown, muddy water from the 1964
flood, and over-stocking of rainbow trout fingerling.
Fishermen are aware
of the poor condition of trout at Ochoco Reservoir and that water levels
have been too low for boat launching.
The lack of harvest magnifies the
over-population problem.
It can be theorized that Round Butte and Prineville Reservoirs
may provide several additional years of satisfactory fishing in face of
their respective rough fish populations; whereas, Ochoco Reservoir may
require chemical treatment to remove rough fish competition in order to
restore a productive sport fishery.
Job 3
Limnology, Water Quality, and Productivity Studies of Reservoirs
Objective
To determine the relationship of water quality, productivity, and
basic limnology to reservoir management.
-37-
Introduction
Establishing temperature profiles and dissolved oxygen levels
for the three reservoirs was accomplished.
Considerably more data must
be collected before an attempt is made to relate the various phases of
limnology to the fishery management of Central Oregon reservoirs.
The following, then, is a sample accumulation of data collected
that will contribute to management recommendations for the reservoirs.
Ochoco Reservoir
Figure 9 depicts temperature profiles with dissolved oxygen
content for various depths at Och000 Reservoirs
Prineville Reservoir
Collection of temperature profiles and dissolved oxygen content
have been collected for the past four years at Prineville Reservoir.
The
general pattern for each has been approximately the same, and therefore,
Figure 10 presents average monthly temperature, and dissolved oxygen data.
Dissolved oxygen samples stay at a relatively high level until
late summer and fall when samples range from 3.0 to 0.5 ppm in the hypolimnion near 100 feet in depth.
Water quality tests taken at Prineville Reservoir on August 15,
1963 are given in Table 8.
The suface pH taken for the past four years has been near constant
varying from 8.3 to 8.2 ppm.
-38-
to
20
2,
30
1:;) e
.310
p /17 in Feet
4ro
60
I
70
0 Dissolved Oxygen in Thr/s Per Ali /bon.
80
OXYGEN CONTENT/ OCHOCO RESERVOIR
TEMPERATIIRE PROFILES WITH DISSOLVED
Fi9v.--e 9
90
0)
L
Ok
30
50
60
70
80
0
0
0
12
24
/Ce6ruclrf
NarcA
M
Nc/u/y
June
Ociaeer
s'e
36
60
176w/A in' .4a,ef
4v
C)
72
tif
96
108
Oissalved Oxygen in /41,-/sIrMilliott
9501-VED OXYGEN
/4Y.ERAGE MMPERATIIRE PROFILES
/263 -/966
PRINEVILLE RESERVOIR
.479tir-e /O.
Table 8
Water Chemistry,
Prineville Reservoir, 1963
Parts per million
35 feet
Surface
Test
70 feet
Dissolved oxygen
7.55
4.20
0.92
pH
8.30
7.60
7.20
Carbon dioxide
0.00
5.25
13.20
Phenophthalein alkalinity
3.00
0.00
0.00
63.00
60.00
61.00
Methyl orange alkalinity
Secchi disc transparencies have been obtained with a standard
20-centimenter disc at three stations on Prineville Reservoir.
The sus-
pended particulate matter within the reservoir varies from the spring
run-off to heavy summer plankton blooms and clearer water in the late fall.
Readings in an approximate range of 0.5 meter to 4.0 meters are characteristic of the reservoir.
An average of transparencies show the area near
the dam and an area near center-point average 2.05 meters for the year, and
the upper end of the reservoir averaging 1.59 meters.
Productivity measurements of the reservoir bottom have met with
limited success.
Attempts with the Eckman and Peterson dredge have been
unable to penetrate the bottom to collect aquatic organisms.
- 41
-
Round Butte Reservoir
Temperature profiles and dissolved oxygen samples have been
collected on each of the three arms of Round Butte Reservoir during the
summer months of June through August for 1964 and 1965.
Data for the
Metolius River section are given in Figure 11, Deschutes River section,
Figure 12, and Crooked River section, Figure 13.
Secchi disc transparencies collected on each section reveal
higher readings than those found at Prineville Reservoir.
The trans-
parency range for the Metolius arm during the summer months is 2.0 to
7.7 meters with an average reading of 5.0 meters.
The range for the
Deschutes arm is 3.8 to 6.4 meters, averaging 5.4 meters.
arm ranges from 3.6 to 7.4 meters and averages 5.5 meters.
Crooked River
/2
24
36
48
60
® Dissolved Oxygen
72
84
/./7 Poe-715 ICkk71,11//0/7
1,15SOLVED OXYGEN
TEMPERA? URE PROFILES,
/964 - /966
ROUND BUTTE RESERVOIR
11/1EroLtus ARM
Ely uve //.
96
108
15
50
65
TO
73
56
12.
/966
48
Dep/17 in Fed
60
72
&f
Dissolved OxyRen in Ririsfer-Alillion
40155OLVED OXYGEN
rthIPERArz/IFE- PROF /
1961
13,ESCH CITE S ARM
RoUND BUTT RESERVOIR
Fiyar-e
96
108
°
45
50
'&55
60
769
73
4//te 45.
C-
24
36
¢8
Depth it, Feet
60
0/5solved Oxygen in Paris
72
8g
47/W/o /7
D/5501___VED OXYGEN
TEM 17E-RAT& RE /73;c' 0 FT / 4. ES
/964 - /966
ROUND BUTTE RESERVOIR
IFm
CROOKED 74/ v
/4"-i9zit-e /3.
96
/as