On December 3, 2014, the California Fish and Game Commission adopted a regulation for annual Special Low Flow Conditions from October 1 through April 30 for coastal streams within the three counties. This regulation now bases flow closure conditions for Mendocino County streams on the Navarro River gauge near Navarro by establishing a minimum flow of 200 cubic feet per second (cfs) at the USGS gauging station on the main stem Navarro River near Navarro, Calif.
With the exception of the Russian River, coastal streams in Marin and Sonoma counties will be based on the South Fork Gualala River gauge near Sea Ranch with the establishment of a minimum flow of 150 cfs at the gauging station on the South Fork Gualala River near Sea Ranch (Sonoma County).
The new regulation also establishes low flow conditions for the Russian River in Mendocino and Sonoma counties based on the Russian River gauge near Guerneville. These streams will be closed to fishing when stream conditions fall below the minimum flow of 300 cfs at the gauging station located on the main stem Russian River near Guerneville (Sonoma County).
Low stream flow conditions prevent the movement of salmon and steelhead to their spawning grounds, increasing their vulnerability to predation, physiological stress and angling pressure. These coastal streams provide critical life-stage habitat for coastal Chinook salmon, coho salmon and steelhead trout. All three of these species are listed under the federal Endangered Species Act (ESA). Coho salmon is also listed under the California ESA.
In addition, CDFW will make low flow stream closure information available to the public by a telephone recorded message updated, as necessary, no later than 1 p.m. each Monday, Wednesday and Friday as to whether any stream will be open or closed to fishing. It shall be the responsibility of the angler to use the telephone number designated in the sport fishing regulations booklet to obtain information on the status of any stream.
The number for low flow stream closure information is (707) 822-3164 for Mendocino County and (707) 944-5533 for Sonoma, Marin and Napa counties.