That's because of an arrangement between recreational companies and the Sacramento Municipal Utility District.
SMUD has agreed to release water flows for hydro-electric generation at times when rafters are out on the water, primarily on the weekends.
Scott Armstrong owns All-Outdoors California Whitewater Rafting.
On Capital Public Radio's Insight today, Armstrong said weekday rafting could be a little too calm...
"...There will be water on weekends, there'll be water at good flows. It'll be a little bit less than it has been in the last couple of years. But because of the agreement and because of what SMUD has to release anyway for hydro-power, we will have good recreational flows."
~Scott Armstrong, All-Outdoors California Whitewater Rafting
Armstrong predicts flows will be strongest from mid-June through Labor Day Weekend.
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.