Thomson Dam No. 9, located in Thomson, Minnesota, stands as a vital structure along the St. Louis River, serving multiple purposes including hydroelectric power generation and recreation. Completed in 1907, this gravity dam stands at a height of 11 feet and has a length of 100 feet, with a storage capacity of 4,352 acre-feet. The dam is under the jurisdiction of the Minnesota Department of Natural Resources and is regulated by the Federal Energy Regulatory Commission.

With its high hazard potential, Thomson Dam No. 9 is subject to regular state inspections and enforcement to ensure its safety and integrity. The dam is part of a network of 13 associated structures, contributing to the management of water resources in the area. The location of the dam in Carlton County, Minnesota, highlights its significance in water resource management and climate resilience efforts in the region.

Managed by the St. Paul District of the US Army Corps of Engineers, Thomson Dam No. 9 plays a crucial role in water storage and flow regulation along the St. Louis River. Its history, design, and purpose make it a key asset for both water management and recreational activities, showcasing the intersection of human infrastructure and natural resources in the context of climate change and sustainable development.