Name: Coho Chinook and Steelhead Stratum _ California and Southern Oregon Coast _ NOAA _ ds3003
Display Field: POP_NAME
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: The basins_final data layer contains watershed boundary polygons that represent habitat areas for candidate independent populations of steelhead (O. mykiss), Chinook salmon (Oncorhynchus tshawytscha), and Coho salmon (Oncorhynchus kisutch) in the State of California and Southern Oregon. Watersheds were delineated upstream from candidate independent steelhead population Watershed sizes are not uniform and do not correspond to any specific order of hydrologic units, but rather, vary with the area drained by each river. Upper portions of watersheds were delineated by merging "planning watershed" units from the California watershed coverage (Calwater 2.2) created by the California Department of Forestry and Fire Protection. However, along the lower portion of streams within the Central Valley, itself, Calwater boundaries often followed political boundaries or other features. Therefore, boundaries in the lower portion of watersheds were hand-drawn using digital elevation models (DEMs) to determine watershed boundaries along the valley floor.