January 25, 2012 12:32 pm Coho Salmon Running the Watershed The appearance of salmon is exciting, because it was feared the population was on the verge of extinction. US & World Videos 2:42 Forecast: Warm day, Saturday rain 3:05 Downtown First Thursdays offers new hope to struggling SF merchants 1:02 Crews knock down 2-alarm structure fire in SF's Nob Hill 1:11 24-hour online fundraiser underway for Peninsula nonprofits 1:43 Kari's forecast: Warm day, Saturday rain