The U.S. Bureau of Reclamation has cut water releases from 1,100 cubic feet per second down to 500 feet.
"That has exposed some of the fall run salmon nests or 'redds' as they're called, r-e-d-d."
Tom Ghoring is with the Sacramento Water Forum.
On Capital Public Radio's Insight with Beth Ruyak, Ghoring said early surveys show that reductions, prompted by the dry winter, have left 15 percent of salmon nests or "redds" out of water.
"We know that exposing them is harmful to them. An exposed redd doesn't necessarily kill the eggs buried in the redd, but some of the nearby redds that are still underwater may be harmed so much that they could die."
~Tom Ghoring, Sacramento Water Forum
Reclamation officials say reducing water flows into the American River will help conserve the water supply stored behind Folsom Dam.
Insight will have more about how the lack of rain is impacting the region, coming up at 9 a.m.
A new study shows fire-fighting foam containing highly fluorinated chemicals is contaminating drinking water supplies around many of the nation's military bases, airports and industrial sites.
It has been a busy fire season across California. But there are fewer fires in the state’s 18 U.S. national forests so far this year, compared to 2015.
Update 8:00 p.m. Sunday: Crews are making "good progress" on the Cold Fire in Yolo County, now at 60% containment. In Monterey County, the Soberanes Fire remains at 45% containment with wind creating an additional challenge for firefighters.
The Soberanes Fire near Big Sur is burning in a rugged area that hasn't "seen fire in decades." The wildfire is 45 percent contained at 57,500 acres.
The number of acres burned by wildfires in the U.S. is about average for this time of year. But, in California, the 'new normal' includes larger and more frequent wildfires.