
For many years after Camanche Dam was built, the Mokelumne River, a major tributary of the San Joaquin River and the Delta, hosted small runs of Chinook salmon.
The historic runs of steelhead after the construction of the dam averaged only 100 fish and no steelhead returned to spawn many years.
But both steelhead and salmon runs have rebounded in recent years, due to a number of factors. In welcome good news for Central Valley salmon populations, the California Department of Fish and Wildlife and the East Bay Municipal Utility District report record fall spawning returns of Chinook salmon and steelhead to the Mokelumne River.
The hatchery staff has trapped a total of 10,742 adults to date, a combination of 5,908 grilse and 4,834 adults. A total of 15,444 salmon had been recorded over Woodbridge Dam as of November 15, according to Will Smith, hatchery manager.
The run is on track to break the record run of 18,000 fish in 2011 that went over Woodbridge Dam near Lodi. That year, 15,922 salmon were trapped by the fish hatchery.
Over a three-hour period on November 16, staff at the Department of Fish and Wildlife’s Mokelumne River Fish Hatchery in Clements spawned fall-run Chinook salmon as school children toured the hatchery and photographers and TV cameramen from a variety of media outlets captured the activities.
The salmon season is at its peak now and the hatchery will continue to spawn fish as they move into the facility. Smith said they should continue spawning through December 18.
“I think the big showing of fish bodes well for the ocean fishery this coming year,” said Smith.
For the second year in a row, the hatchery has also counted a record number of steelhead.