History of Rapidan Dam in Timeline

The Rapidan Dam, a concrete gravity dam built in 1908-1910, stands on the Blue Earth River near Rapidan, Minnesota. Owned by Blue Earth County, it generates hydroelectric power. North American Hydro operates the dam and its power plant under contract with the county. The dam is situated southwest of Mankato, Minnesota.

1908: Construction of Rapidan Dam Begins

Construction on the Rapidan Dam began in 1908. It was built on the Blue Earth River to generate hydroelectric power.

1910: Rapidan Dam Operational

After its completion, the Rapidan Dam became operational in 1910, marking the beginning of its hydroelectric power generation.

1970: Blue Earth County Acquires Rapidan Dam

In 1970, ownership of the Rapidan Dam was transferred to Blue Earth County, who took over its operation.

2021: Studies Commissioned to Address Dam's Condition

Recognizing the deteriorating state of the Rapidan Dam, Blue Earth County commissioned two studies in 2021 to investigate potential solutions: repairing or removing the dam.

June 2022: Community Feedback on Dam Options

Between April and June 2022, Blue Earth County actively sought public input regarding the proposed options for the Rapidan Dam, aiming to understand community perspectives on repair versus removal.

June 24, 2024: Rapidan Dam Failure and Flooding

On June 24, 2024, following heavy rainfall and flooding of the Blue Earth River, the Rapidan Dam suffered a catastrophic failure. The river breached the dam's sides, leading to widespread flooding and significant damage. An Xcel Energy substation was destroyed, cutting power to approximately 600 customers. Additionally, a store and another building were destroyed. The event prompted a flash flood warning and evacuations.