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In April 2008, a particularly cold month in a dry year, young salmon were found to have been fatally stranded along banks of the Russian River stream system, which drains Sonoma and Mendocino Counties. Federal scientists concluded the deaths were caused by abrupt declines in water level that occurred when water was drained from the streams and sprayed on vineyards and orchards to prevent frost damage. Following a series of hearings and the preparation of an environmental impact report, the State Water Resources Control Board (Board) adopted a regulation that is likely to require a reduction in diversion of water from the stream system for frost protection, at least under certain circumstances. The regulation itself contains no substantive regulation of water use, instead delegating the task of formulating regulatory programs to local governing bodies composed of the diverting growers themselves. The regulation declares that any water use inconsistent with the programs, once they have been formulated and approved by the Board, is unreasonable and therefore prohibited. The trial court granted a writ of mandate invalidating the regulation on several grounds. We…