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.
Cal Fire and U.S. Forest Service crews are working in steep terrain to contain the Trailhead Fire in Placer and El Dorado counties. The fire had grown to 2,551 acres Friday and was 12 percent contained.
Forecasters say the threat of wildfires will remain high in Southern California and the Southwest in July and August because of persistent drought and because summer rains may not be as consistent as usual.
Fire restrictions are in effect on U.S. Forest Service lands in the Lake Tahoe Basin. Officials say illegal and unattended campfires cause over 90 percent of wildfires within the Lake Tahoe Basin.
The drought in California, in its fifth consecutive year, has created conditions ripe for wildfires. The National Interagency Fire Center predicts "above normal" fire potential through September for portions of California, Nevada and Idaho.
A new report shows there are certain highways in California that are "hot spots" for wildlife-vehicle collisions.