INTRODUCTION

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

General GeologyThe 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).

Figures2. Geologic Map3. Soil Map

Hydrologic Summary

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. Figures9. Watershed outlines and stream overlays

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 10 – Lower Coast Fork of Willamette River near Creswell

References Cited

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.htmhttp://www.willamette-riverkeeper.org/images/DSCN0675.JPG

Lower Coast Fork Willamette River – Lane County, Oregon

Prepared by:Rachel Johnson

Patrick FerrariES 341

You can insert images throughout poster

Figure 4 – Quad DRGs

Physiography

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.Figures4. Quad DRGs5. Quad DOQs6. Quad DEMs7. Precipitation map8. Vegetation map

Figure 3 – Soil Map

Figure 1 - Map of Oregon with watershed location

Figure 5 – Quad DOQs

Figure 9 – Watershed Outline & Stream Overlay

Figure 2 – Geologic (bedrock) Map.

Figure 7: Precipitation Map

Figure 6 – Quad DEMs

Figure 8 – Vegetation Map

Figure 11 – Side channel of the Lower Coast Fork