Lower Coast Fork Willamette River – Lane County, Oregon
Prepared by:
Rachel Johnson
Patrick Ferrari
ES 341
INTRODUCTION
Physiography
The Lower Coast Fork of the Willamette River is the southern-most part of
the Willamette. Much of the land is used for agriculture. Damming the river has
changed the river. Habitats have changed and flow volume has decreased.
Watershed Location
The Lower Coast of the Willamette is located in central Lane County. Statewide, it
located roughly in the middle part of the Willamette Valley.
Figures:
1. Map of Oregon with watershed location
The vegetation in this area is mostly agricultural. Other common vegetation
types include Douglas Fir, White Oak Forests, and Regenerating Young Forests. It
has an elevation range of 110 ft at the northern end to 1125 ft in the southeast.
Precipitation ranges from 36- 70 inches per year, but the majority of the
watershed gets 40-52 inches per year.
Figures
4. Quad DRGs
5. Quad DOQs
6. Quad DEMs
7. Precipitation map
8. Vegetation map
You can insert images throughout poster
Figure 10 – Lower Coast Fork of Willamette River near Creswell
Figure 7:
Precipitation Map
Figure 4 – Quad DRGs
Figure 8 – Vegetation Map
Conclusions
(1) The Lower Coast of the Willamette is located in central Lane County.
(2) It contains a total drainage area of 360 sq km.
(3) The majority of the watershed gets 40-52 inches per year.
(4) The vegetation in this area is mostly agricultural. Other common vegetation
types include Douglas Fir, White Oak Forests, and Regenerating Young
Forests.
(5) It has an elevation range of 110 ft at the northern end to 1125 ft in the
southeast.
(6) The bedrock of the watershed mostly consists of recent alluvium (Qal) and
rocks from the Fisher or Eugene Formation (Tfe). Other types of bedrock
include basaltic rock (Tfeb), sedimentary and volcaniclastic rocks (Tus), and
Marine Eugene Formation (Tfee).
Figure 1 - Map of Oregon with watershed location
General Geology
The bedrock of the watershed mostly consists of recent alluvium (Qal) and
rocks from the Fisher or Eugene Formation (Tfe). Other types of bedrock
include basaltic rock (Tfeb), sedimentary and volcaniclastic rocks (Tus), and
Marine Eugene Formation (Tfee).
Figures
2. Geologic Map
3. Soil Map
Figure 11 – Side
channel of the Lower
Coast Fork
Figure 5 – Quad DOQs
Figure 6 – Quad DEMs
Hydrologic Summary
References Cited
The Lower Coast Fork of the Willamette River contains a total drainage area of
360 sq km. It has a total length of 22.8 km and a total width of 22.5 km. The
watershed includes 13 subbasins, which have an average area of 27 sq km. 1248
stream segments and tributaries are included in the watershed, 632 are first order
stream segments and 323 are second order stream segments.
Figures
9. Watershed outlines and stream overlays
Figure 3 – Soil Map
Figure 2 – Geologic (bedrock) Map.
Figure 9 – Watershed Outline
& Stream Overlay
DRG:
REO Oregon 7.5-Minute DRG's Sorted by Quad Name
http://www.reo.gov/reo/data/DRG_Files/indexes/orequadindex.asp
DEM:
State of Oregon Geospatial Data Clearinghouse
http://gis.oregon.gov/DAS/EISPD/GEO/data/dems.shtml
WebGIS Resource (7.5 Min DEMs available)
http://www.webgis.com/terr_pages/OR/dem75/lane.html
Bedrock Geology:
State Geologic Maps from the USGS
http://tin.er.usgs.gov/geology/state/state.php?state=OR
Annual Rainfall/Precipitation:
USGS Seamless Data Distribution System (continuous DEM coverage’s of US)
http://sagemap.wr.usgs.gov/SearchData.aspx
Soils:
NRCS Soil Data Mart (soil surveys)
http://soildatamart.nrcs.usda.gov/
Vegetation:
State of Oregon Geospatial Data Clearinghouse
http://gis.oregon.gov/DAS/EISPD/GEO/alphalist.shtml
Roads:
State of Oregon Geospatial Data Clearinghouse
http://gis.oregon.gov/DAS/EISPD/GEO/alphalist.shtml
Streams:
State of Oregon Geospatial Data Clearinghouse
http://gis.oregon.gov/DAS/EISPD/GEO/alphalist.shtml
DOQs:
State of Oregon Geospatial Data Clearinghouse
http://gis.oregon.gov/DAS/EISPD/GEO/data/doq.shtml#DOQ_Downloads
OTHER:
Oregon USGS DRGs from the Libre Map Project
http://libremap.org/data/state/oregon/drg/
Interactive USGS Quad Index Code Locator Map
http://ferm.forestry.oregonstate.edu/research/gis/t_dem.htm
Pictures:
http://www.willamette-riverkeeper.org/nww1.htm
http://www.willamette-riverkeeper.org/images/DSCN0675.JPG