Endangered salmon and vineyards vulnerable to frost are both depending on flows in local waterways to protect them, but there isn’t enough water available to serve both competing needs.

 The vines shown at left have been sprayed with water that then freezes around the budding greenery. This protects the vine by holding the enclosed plant material at exactly 32 degrees, when the surrounding air is colder and could damage the new growth.

Frost is usually not a concern to vineyardists in the fall, as the grapes are usually harvested before the weather turns cold. But in the springtime, explains Nick Frey, President of the Sonoma County Winegrape Commission, a cold spell can devastate the vines, leaving them looking like this.

Using stream water for vineyard frost protection is  problematic for local fisheries in several areas in California, says Jeff Miller of the Center for Biological Diversity, but the situation is especially acute in the Russian River’s watershed.

A series of presentations are planned over the next two weeks to alert vineyard owners and growers to the possibility of new rules on water use for frost protection, and begin collecting data on water use for that purpose.  They will be held:

• Wednesday,  Jan. 6, 4 p.m., at the Kendall Jackson Wine Center, 5007 Fulton Rd. in Fulton
• Thursday, Jan. 7, 4 p.m., Dutton Pavilion at Santa Rosa Junior College Shone Farm, 7450 Steve Olson Lane, Forestville
• Friday,  Jan. 8, 10 a.m., Knights Valley Fire Department, 16850 Spencer Lane, Calistoga
• Friday  Jan. 8, 4 p.m., Healdsburg Community Center at Foss Creek Elementary School, 1557 Healdsburg Ave., Healdsburg
• Thursday, Jan. 14, 10 a.m., Dutton Pavilion (see Jan. 7, above)

A summary of the history of this issue, as monitored by the California State Water Resources Control Board, can be found here.