The work, in rural Stanislaus County, marks an unlikely partnership between the city of San Francisco and two large irrigation districts to try to revive the river’s struggling salmon population.

A river otter carries seaweed back to its nest Thursday, Jan. 3, 2013, in San Francisco. For the first time in decades, a river otter has made San Francisco its home, taking up residence in the ...

Rare San Francisco river otter stumps researchers The first river otter seen in the city in decades has become a local celebrity -- and harbinger of cleaner water . By Jason Dearen.

Several environmental groups say San Francisco’s drought risk is overstated and asked the city on Tuesday to rethink how its uses the Tuolumne River. They said chinook salmon and other wildlife ...