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This map shows a summary of the presence/absence of coho salmon young-of-the-year in streams in the north portion of the
California Department of Fish and Game's (CDFG) Central Coast Region for the years 1988-1999. Coho populations are most
persistent in the central Mendocino coast and southwestern Marin County. This map contains data for all the streams listed as
known historically to harbor coho salmon in a draft CDFG database, but there are likely other historical coho streams that are not
included in that database. Absence data are provisional pending more extensive study, because coho may exist in some streams
but only occur in some years or may have resided in other reaches of streams not surveyed. Some streams from the CDFG
database are not included in this shapefile hydrography layers were not available (including the Eel River, the coast north of Wages
Creek, and coastline adjacent to the Gualala River). This map/database groups data at the scale of entire streams, and differences
in coho presence/absence between different reaches in the same stream are not shown. Because of this, some streams appear on
this map to have coho above dams, where in reality they almost certainly do not.
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