Rapidan Dam Faces Imminent Failure Amid Severe Flooding in Minnesota

Summary:
Southern Minnesota is currently experiencing severe flooding, significantly impacting the Rapidan Dam on the Blue Earth River near Mankato. Built in 1910, the dam is now in an "imminent failure condition," according to the Blue Earth County Sheriff’s Office. The dam has suffered erosion, slope-cutting, and debris buildup due to the river’s overflow, leading to a "partial failure" on its west abutment. Officials have activated the Rapidan Dam Emergency Action Plan, notifying residents and relevant agencies. River levels peaked at 34,800 cubic feet per second on Monday but have since slightly decreased. An Xcel Energy substation was swept away, affecting the power supply to 600 customers. The dam previously received a "poor condition" rating with "significant" hazard potential. Governor Tim Walz has indicated that the state may seek federal disaster assistance if damage thresholds are met. Several local infrastructures, including the Blue Earth County Road 9 bridge, are closed for safety. No mass evacuations have been ordered yet.