Blair Mill, located in Trempealeau, Wisconsin, is a historic dam completed in 1869 on the Trempealeau River. Owned by the local government, this buttress dam serves purposes such as recreation and water management. With a height of 13 feet and a length of 150 feet, Blair Mill has a storage capacity of 170 acre-feet and a normal storage of 120 acre-feet. The dam has a controlled spillway with a width of 73 feet and a low hazard potential, rated in fair condition as of May 2020.

Despite being over 150 years old, Blair Mill has undergone modifications in 1919 and 1998 to ensure its structural integrity. Inspected every 10 years, the dam meets regulatory requirements set by the Wisconsin Department of Natural Resources. The risk assessment for Blair Mill is rated as very high (1), emphasizing the importance of ongoing risk management measures. With its picturesque location and historical significance, Blair Mill continues to play a vital role in water resource management and recreation in the region, under the oversight of the local government and state regulatory agency.