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 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 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 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 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 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 DEM: State of Oregon Geospatial Data Clearinghouse WebGIS Resource (7.5 Min DEMs available) Bedrock Geology: State Geologic Maps from the USGS Annual Rainfall/Precipitation: USGS Seamless Data Distribution System (continuous DEM coverage’s of US) Soils: NRCS Soil Data Mart (soil surveys) Vegetation: State of Oregon Geospatial Data Clearinghouse Roads: State of Oregon Geospatial Data Clearinghouse Streams: State of Oregon Geospatial Data Clearinghouse DOQs: State of Oregon Geospatial Data Clearinghouse OTHER: Oregon USGS DRGs from the Libre Map Project Interactive USGS Quad Index Code Locator Map Pictures: Lower Coast Fork Willamette River – Lane County, Oregon Prepared by: Rachel Johnson Patrick Ferrari ES 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 inches per year, but the majority of the watershed gets inches per year. Figures 4. Quad DRGs 5. Quad DOQs 6. Quad DEMs 7. Precipitation map 8. 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