Federal officials are warning that a small dam in Truckee that provides about one-third of the flood storage capacity for Reno, Nevada, on the Truckee River is at risk of collapsing.
The U-S Army Corps of Engineers says the Martis Creek Dam is among the six most at risk in its entire 610-dam inventory and is calling for swift action to shore it up.
Some officials say a dam failure might be catastropic for downstream communities, but other officials say it's uncertain how much damage would occur.
The Corps says the dam has developed seepage problems since it was built in 1972.
The Corps plans to keep the reservoir at a minimum level until a decision on the dam's fate is made.
Solutions range from repairing the dam to removing it.