A federal recovery plan for coho salmon, an endangered species, will be outlined during a workshop in Santa Rosa Thursday.

The plan for the central California coast, which stretches from Santa Cruz to Punta Gorda above Fort Bragg, is meant to keep coho salmon from going extinct, said Charlotte Ambrose, a recovery coordinator for National Marine Fisheries Service.

It is an effort that could take 50 to 100 years and cost as much as $1.5 billion, she said.

In Sonoma County, the heart of the program is continued funding of a program at the Warm Springs dam fish hatchery to raise coho salmon for planting in spawning tributaries of the Russian River.

The program also calls for increased restoration of habitat by using logs and boulders to create pools and eddies for fish to breed and preservation of the habitat that exists.

The workshop is from 10 a.m. to noon at the Wells Fargo Center for the Arts. A workshop also will be held from 10 a.m. to noon Sept. 11 at the Redwood Empire Fairgrounds Arts Building in Ukiah.

— Bob Norberg