Tamarac River R1, also known as the Overton Structure, is a gravity dam located on the Tamarac River in Stephen, Minnesota. Built in 1975 by the USDA NRCS, this dam serves as a key flood risk reduction measure for the local community. With a dam height of 21 feet and a length of 11,000 feet, it provides a storage capacity of 1,168 acre-feet and a maximum discharge of 2,240 cubic feet per second.

Managed by the Minnesota Department of Natural Resources, Tamarac River R1 is state-regulated, permitted, inspected, and enforced to ensure its structural integrity and safety. The dam is classified as low hazard potential with a satisfactory condition assessment as of June 2017. Despite its moderate risk assessment, the emergency action plan for the dam is under review, indicating ongoing efforts to enhance preparedness and risk management measures for potential emergencies.

Overall, Tamarac River R1 plays a crucial role in protecting the surrounding area from flooding events, highlighting the importance of effective water resource management and climate resilience strategies in safeguarding communities against natural disasters. With its strategic location on the Tamarac River and efficient design, this dam stands as a testament to the collaborative efforts of local government agencies and the USDA NRCS in mitigating flood risks and ensuring public safety in Marshall County, Minnesota.