Olson Dam, also known as Tongue River WS Dam T7-1, is a local government-owned structure located in Pembina, North Dakota. Designed by the USDA NRCS and completed in 1957, this earth dam stands at a height of 67 feet and has a structural height of 74 feet, with a length of 990 feet. Its primary purpose is flood risk reduction, with a storage capacity of 1077 acre-feet and a surface area of 7.1 acres.

The dam, regulated by the NDSWC, features an uncontrolled spillway with a width of 250 feet and a single valve outlet gate. Despite its high hazard potential, recent condition assessments have deemed it to be in poor condition as of April 2021. The dam has undergone modifications in 1985 for structural improvements, and its emergency action plan (EAP) status is currently unknown. With a moderate risk assessment rating, it is crucial for authorities to address the dam's deteriorating condition to ensure the safety and integrity of this vital water resource infrastructure.

For water resource and climate enthusiasts, Olson Dam serves as a significant component of the Tongue River watershed, providing essential flood protection for the surrounding area. With its historical significance and ongoing regulatory oversight, this dam exemplifies the critical role that infrastructure plays in managing water resources and mitigating flood risks. As efforts continue to maintain and improve the dam's condition, it is essential for stakeholders to prioritize its safety and resilience in the face of changing climatic conditions and evolving water management challenges.