Instream Flow

Cedar River Fisheries and Instream Flow Study

Cedar River

The Cedar River is the source of 70 percent of Seattle’s municipal and industrial water supply.  Below the City’s diversion, the river supports a large spawning population of sockeye salmon and a valued run of steelhead trout.  These two competing demands gave the Cedar River fisheries studies a very high profile with City officials, agency heads and purveyors.

DTA conducted extensive fisheries studies, including the Instream Flow Incremental Methodology (IFIM),and aerial videography to determine the instream flow needs of the Cedar River’s anadromous salmonid populations.  The investigations and analysis performed by Devine Tarbell & Associates, Inc.’s (DTA) staff are a component of the Habitat Conservation Plan (HCP) developed for the City of Seattle.

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