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This dataset includes the boundaries evolutionarily significant units (ESUs) of salmon on the West Coast of the United States of America. An evolutionarily significant unit, or ESU, of Pacific salmon is considered to be a "distinct population segment" and thus a "species" under the Endangered Species Act. Chinook salmon, Chum salmon, Coho salmon, Pink salmon, Sockeye salmon, and steelhead are all included in the dataset. ESU boundaries were compiled by the GIS group at the Bonneville Power Administration from various sources based on written descriptions in NOAA Fisheries Service status reviews (available upon request) and mapping provided by the Fisheries Service. Initial boundaries were derived from USGS 1:250,000...