In an early victory for the nation’s largest dam-removal project, the first salmon in more than a century is believed to have pushed up the Klamath River this past week into waters formerly blocked by dams. Scientists with the nonprofit California Trout told the Chronicle that their sonar camera captured what was almost certainly a chinook salmon migrating upstream Thursday past the site where Iron Gate Dam once stood, just south of the California-Oregon border. The roughly 2½-foot-long fish is thought to be part of the Klamath River’s fall run, the first and largest run of salmon expected to benefit from the recent removal of four hydroelectric dams on the 250-mile waterway.

Other salmon and Klamath Dam removal articles:

• PPIC: Blog: A promising new effort to save California’s salmon
• California Water Blog: The foodscape – (re) connecting salmon to the productive capacity of their watersheds
• SFGate: Before and after photos show California’s unprecedented dam removal
• NBC Montana: University of Montana bio station studies toxic cyanobacteria in rivers