Authorities say a wall of water that flowed down the Middle Fork of the American River this morning subsided before it caused any apparent damage or injuries.
A sudden release from Ralston Reservoir southeast of Auburn sent a wall of water three- to four-feet high down the river.
Helicopters warned anyone nearby to flee to higher ground and monitored the muddy water as it approached Highway 49.
But the surge largely subsided by the time it arrived at the highway.
It was heading into Folsom Lake at about 4 miles per hour.
Authorities by that time were more worried about the mud and debris than about the remaining force or height of the water.
There were no immediate reports of injuries or damage.