Thomson Dam No 11, also known as Nos 11, 11-1/2, and Upper Gate House, is a key structure located in Thomson, Minnesota, along the St. Louis River. Built in 1907 for hydroelectric purposes, this gravity dam stands at 17 feet tall and stretches 365 feet in length, with a storage capacity of 4352 acre-feet. Owned and regulated by the Minnesota Department of Natural Resources, this dam is inspected regularly to ensure its safety and functionality, with the Federal Energy Regulatory Commission overseeing its operation.

With a high hazard potential due to its location and design, Thomson Dam No 11 plays a crucial role in managing water resources and generating hydroelectric power in the region. Its controlled spillway and associated structures support its function for flood control, recreation, and water storage. The dam's risk assessment indicates a very high level of risk, highlighting the importance of ongoing monitoring, maintenance, and emergency preparedness to safeguard the surrounding community and environment.

Thomson Dam No 11 serves as a historic and vital infrastructure for water resource management and climate resilience in Carlton County, Minnesota. As part of the larger St. Paul District of the US Army Corps of Engineers, this dam exemplifies the collaboration between state and federal agencies to ensure the safety, sustainability, and efficiency of water infrastructure for the benefit of both people and the environment.