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.
Researchers say California has been overdrawing its water account for a century.
Researchers at UC Davis fear that California’s drought may soon claim its first victim, the Red Hills Roach. The tiny fish is losing its water. Scientists fear it may soon be pushed to extinction.
A UC Davis report shows the drought has brought positive and negative effects to Lake Tahoe.
California's farm production costs totaled $36.6 billion in 2013, an 8.6 percent jump from the previous year. Higher rates for feed, labor, improvements and water contributed to the jump.
Californians will be voting on a new water bond this fall. On Wednesday night, Gov. Jerry Brown and state lawmakers replaced the $11 billion bond on the November ballot with a smaller one they believe has a better chance of passing at the polls.