Seven people have drowned in July in the Sacramento and American Rivers.
Four of the drowning deaths have occurred at Tiscornia Park in Sacramento where the two rivers meet.
Chris Harvey is with the Sacramento Fire Department. He says many of the threats to people on the river are unseen.
"That side of the Sacramento does drop off very quickly," says Harvey. "There's a lot of underwater obstacles. There's a lot of concrete debris and stuff. There's a concrete wing dam under the water over that sticks out at that point. We had a drowning over there a couple of weeks ago. We just want people to be aware of their surroundings and if they're not the best swimmer in the world, consider wearing a life jacket."
Life preservers are available for day-use by anyone at stations along the American River. Life jackets are mandatory for children 13 and younger.
Despite the drought and low water levels in some rivers and lakes, water flows from Folsom Dam are still about 3,700 cubic feet per second.