LITTLE GOOSE DAM TDG FOREBAY
DATE COMPILED: July 31, 1998 SWM
Revised: July 31, 1998 AL
STATION LOCATION: River mile 70.3 in center of dam and between the spillway and the powerhouse
SOURCE OF DATA: US Army Corps of Engineers Pacific Division Office, data collected by Walla Walla
District Office.
BEGINNING DATA: May 30, 1988
ENDING DATA: Sept. 16, 1996
UNITS: Celsius
DATA DESCRIPTION: Hourly values, usually 6 times per day for 1988 through 90 and 24 hourly values
in 91 through 96; total of about 23,000 hourly values. Daily minimum, maximum, mean, and variability
statistics are available; total 1,307 records.
TITLE OF FILE: Hourly:lgs_tdg88-92.xls, lgs_tdg93-96.xls
Daily: lgs_tdg88-96d.xls
COMPLETENESS OF RECORD:
START
END
5/30/88 ------------- 8/26/88
4/4/89 -------------- 9/12/89
4/24/90 ------------ 9/11/90
4/11/91 ------------- 11/5/91
2/28/92 -------------- 3/8/92
4/8/93 -------------- 9/28/93
4/1/94 --------------- 9/7/94
4/3/95 -------------- 4/27/95
5/3/95
5/10/95 ------------ 6/14/95
6/22/95 ------------ 6/27/95
7/5/95 --------------- 7/9/95
7/19/95 ------------ 7/20/95
8/8/95 ------------- 9/26/95
4/3/96 ------------- 9/16/96
STATION CODE: LGS
COMMENTS
hourly and daily values 1984-87 data missing
hourly and daily values
hourly and daily values
hourly and daily values
hourly and daily values most of 1992 data missing
hourly and daily values
hourly and daily values
hourly and daily values
hourly and daily values for one day
hourly and daily values
hourly and daily values
hourly and daily values
hourly and daily values
hourly and daily values
hourly and daily values 1997 data missing
VARIABILITY:
Daily variability about the daily mean is usually between 0.2 and 1oC but can be over 2oC, especially
during the months of June through September. When the variability is greater than about 0.7oC, it is likely
that it is the result of high values that may not be representative of the cross section and may result in a
daily mean value being biased high. Day-to-day variability during summer months is also high ranging
from 0.5-4oC.
BIAS:
When there is high hourly variability, it can result in variable daily means and/or daily mean values biased
high by 1oC or more, particularly during the months of June through September. The record appeared to be
biased low 1oC during May 1995 relative to cross sectional measurements. Comparison with upstream and
downstream records indicate a positive bias of from 0.2-4oC on a highly variable basis.
REPRESENTATIVE OF CROSS SECTION:
Cross sectional data showed the river to be mixed within 0.2 oC and the location should be representative of
the river except for times of conditional bias or high variability.
GENERAL COMMENTS:
The record shows a variability indicative of a sample location that is exposed to solar heating. Comparison
with upstream and downstream records indicate a positive bias of from 0.2-4oC on a highly variable basis.