Mendocino County Russian River Mainstem and Tributary Water Demand Management Program (WDMP). This website has a tool for reporting likely frost water use along the mainstem Russian River for coordination with operators of Coyote dam to assure there are adequate flows in the river. You must report on a daily basis by 6 PM. This website also has a tool for both mainstem and tributary diverters to report their annual frost water use. Even if you used no water for frost you must report. The deadline for annual reporting is August 15.