Mankato, Minnesota – The Rapidan Dam in Minnesota faces a critical situation following recent flooding along the Blue Earth River. Authorities issued a warning on Monday, declaring that the dam is in a state of “imminent failure condition.”

The Blue Earth County Sheriff’s Office raised concerns about the dam as the river eroded around its sides, leading to debris buildup in the water. They emphasized the need to notify potentially affected individuals and regulatory agencies.

Located outside the city of Mankato, approximately 85 miles southwest of Minneapolis, the dam’s integrity was further compromised when an Xcel Energy substation, serving around 600 customers, was swept away during the early hours of Monday morning. Efforts are underway to replace the destroyed substation and restore power to affected customers.

Minnesota Governor Tim Waltz addressed the situation in a press conference, highlighting the state’s recent heavy rainfall of approximately 18 inches over the past few weeks. This excessive rainfall has saturated the ground, leaving nowhere for the water to go, with the possibility of more rain on the horizon.

The potential failure of the dam poses a significant risk, particularly considering the widespread flooding that has impacted approximately 40 counties thus far. Governor Waltz mentioned the likelihood of seeking a presidential disaster declaration if the extent of the damage necessitates federal assistance.

Originally built in 1910 to serve as an energy source, the Rapidan Dam has experienced significant damage over the years due to recurrent flooding. A 2021 assessment indicated the urgent need for repair or replacement, both of which would incur substantial costs. Doing nothing, as stated by the county’s website, would pose a considerable public safety risk and liability.

Authorities are closely monitoring the dam’s condition, with community feedback being taken into account regarding the best course of action. Last year, efforts were initiated to transfer the dam’s licensure exemption under the federal Energy Regulatory Commission to the Minnesota Department of Natural Resources due to the dam’s impaired hydroelectric capability.

While immediate structural changes to the dam are not proposed, surrendering the exemption signifies a shift in regulatory oversight. The situation remains dynamic as officials work diligently to address the imminent risks associated with the Rapidan Dam’s current state.