Klamath River (Iron Gate Dam to Seiad Creek) Life Stage Periodicities for Chinook, Coho and Steelhead

This report is a compilation of historic and recent published and unpublished literature, field notes, and personal communications pertaining to life stage periodicities for races of chinook salmon (Onchorhynchus tshawyscha), coho salmon (O. kisutch) and steelhead trout (O. mykiss) in the Klamath River, northern California. Periodicity information is necessary to evaluate the effects of magnitude, duration and timing of discharge from Iron Gate Dam on microhabitat for anadromous salmonids of interest in the Klamath River.

In 1984, periodicities for anadromous salmonids were described for the entire Klamath River Basin based on a round table discussion among personnel of the U.S. Fish and Wildlife Service, U.S. Forest Service, California Department of Fish and Game and several private consulting firms (USFWS 1984a). Since 1984, additional information has been collected by numerous agencies which will aid in refining the periodicities described in that report.