A state of emergency has been declared in Minnesota's Blue Earth County as the Rapidan Dam faces a potential failure due to recent flooding of the Blue Earth River. The Blue Earth County Sheriff's Office issued a warning on Monday, stating that the dam is in an "imminent failure condition," urging the public to take necessary precautions.

The flooding of the Blue Earth River has caused significant damage to the dam, with the river cutting around its sides and debris accumulating in the water. The Sheriff's Office highlighted the uncertainty surrounding the dam's fate, stating that it is unclear whether the dam will totally fail or remain in place. Nevertheless, the notification was deemed necessary to inform downstream residents and regulatory agencies.

Located just outside the city of Mankato, approximately 85 miles southwest of Minneapolis, the Rapidan Dam also housed an Xcel Energy substation responsible for supplying power to around 600 customers. Unfortunately, the substation was washed away early Monday morning. Xcel Energy has assured the public that its crews are working with local authorities to replace the destroyed substation and restore power to affected customers.

Speaking at a press conference, Minnesota Governor Tim Walz acknowledged the saturated ground caused by approximately 18 inches of rainfall over the past few weeks. He emphasized the importance of ensuring public safety, protecting property, and safeguarding public infrastructure. Flooding has affected approximately 40 counties in the state, with several declaring a state of emergency.

While the integrity of the Rapidan Dam has held thus far, officials continue to closely monitor the situation. The dam, constructed in 1910 as an energy source and managed by Blue Earth County, has suffered significant damage over the years due to repeated flooding. A recent assessment concluded that the dam needs either repairs or replacement, both of which would require substantial investment.

Repairing the dam would take an estimated four years, with three years dedicated to planning and design. Alternatively, constructing a completely new dam would take approximately 10 years, including the removal and restoration of the river. The county is currently seeking feedback from the community to determine the best course of action.

In efforts to address the dam's deteriorating state, Blue Earth County initiated the process of releasing its licensure exemption under the federal Energy Regulatory Commission last year. This move would place the dam under the control of the Minnesota Department of Natural Resources, removing regulatory authority from the FERC. However, the county clarified that no immediate changes to the dam's structure are being proposed.

With the situation at the Rapidan Dam becoming increasingly critical, Minnesota Governor Tim Walz expressed his readiness to request a presidential disaster declaration if the damage assessment surpasses a threshold that necessitates federal assistance. As the state grapples with the consequences of severe flooding, authorities and local communities remain dedicated to ensuring the safety and well-being of residents while deliberating the future of the endangered dam.