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This map shows a summary of the presence/absence of coho salmon young-of-the-year in streams in the Guerneville sub-basin for the years 1988-1999, displayed with
KRIS sub-basins and 1:100,000 scale streams. Coho salmon were found in only 5 of the 11 historical streams in the sub-basin during the years 2000-2002, which
indicates a substantial decline in coho salmon distribution from historical levels in the sub-basin. This map contains data for all the streams listed as known historically to
harbor coho salmon in a draft California Department of Fish and Game 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. 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.
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