RAPIDIAN, Minn. — Flooding on the Blue Earth River caused the Rapidan Dam to fail on Monday morning. Le Sueur County residents in low-lying areas of the Minnesota River Valley are advised to evacuate, according to the county’s emergency management office.
The National Weather Service has issued a flash flood warning for areas downstream until 4:30 p.m.
The Blue Earth County Sheriff’s Office says debris started accumulating on Sunday at the 114-year-old dam, located about 10 miles southwest of Mankato, placing it “in imminent failure condition.”
Dam operators alerted officials at about 10:36 a.m. Monday the river had significantly eroded earth around the west side of the dam on the south side of Mankato, the National Weather Service says.
Blue Earth Co. Emergency Mgmt.
Pieces of an Xcel Energy building and other county buildings are adding to the debris in the water.
Officials also say the County Road 33 Bridge and County Road 90 Bridge are being closely monitored for debris passing downstream and may be closed if needed.
The Blue Earth County Sheriff’s Office says they are also aware of power outages and are working with Xcel to restore them.
The failure is expected to cause the Minnesota River at Mankato to crest just below major flood state on Tuesday morning, the National Weather Service says.
The Blue Earth River begins in northern Iowa and meets with the river’s west branch in Faribault County in southern Minnesota. From there, it flows 108 miles north past the cities of Blue Earth, Winnebago, and Vernon Center to Mankato, where it enters the Minnesota River.
There are 21 cities in that watershed, of which Mankato and Fairmont are the largest.
This is a developing story. Stay with WCCO.com for more.
