The soon to fail of the Rapidan dam causes evacuations and emergency response

Flooding on the Blue Earth River has caused significant concern for the Rapidan Dam near Mankato, leading to an imminent failure condition. This has prompted Le Sueur County residents in low-lying areas of the Minnesota River Valley to evacuate. The National Weather Service has issued a flash flood warning for areas downstream until 4:30 p.m. Monday.

Rapidan Dam Integrity and Immediate Threat

The Rapidan Dam, located about 10 miles southwest of Mankato, is experiencing severe erosion around its west side, exacerbating the risk of failure. Blue Earth County has reported accumulating debris that further threatens the dam‘s integrity. While the dam’s structural integrity has been confirmed, the threat of failure remains high, necessitating continuous monitoring and preventive measures.

Emergency Response and Monitoring

Public Works, Emergency Management, and Sheriff’s Offices are actively implementing steps from the Rapidan Dam Emergency Action Plan for Imminent Failure. The County is collaborating with Xcel Energy and local infrastructure teams to address the accumulating debris. Emergency crews are also monitoring County Road 33 and County Road 90 bridges for debris passing downstream, with the potential for closures if needed.

Evacuations and Public Safety Measures

No evacuation orders have been issued for Blue Earth County residents, but precautions are in place. The city of North Mankato is constructing an earthen levee to protect against potential flooding. Additionally, the Minnesota Department of Transportation has closed all exit and entrance ramps at Highway 169/Lookout Drive in Mankato and North Mankato as a precautionary measure.

Power Outages and Infrastructure Impact

Flooding has led to power outages, with Xcel Energy reporting the loss of its substation at Rapidan. Crews are working to deploy a mobile unit to restore service to affected customers. Public health officials are reminding residents of the dangers of floodwater contamination and urging them to report storm-related property damage to seek disaster relief.