Arpin is a hydroelectric dam located in Ladysmith, Wisconsin, along the Chippewa River. Built in 1913, this gravity dam stands at 12 feet tall and spans 1590 feet in length, with a capacity for storing up to 980 acre-feet of water. The primary purpose of Arpin is to generate hydroelectric power, but it also serves other functions such as providing for fish and wildlife habitat and recreation opportunities.

Managed by the Federal Energy Regulatory Commission, Arpin has a low hazard potential and a moderate risk assessment rating. The dam features uncontrolled spillways and a variety of outlet gates for water release. Despite its age, Arpin has not undergone recent condition assessments, and its emergency action plan status is not available. However, with inspection frequency set at every 3 years, the dam continues to play a vital role in water resource management and energy production in the region.

Climate and water resource enthusiasts will appreciate the historical significance and engineering marvel of Arpin, as it continues to harness the power of the Chippewa River to generate clean energy while providing valuable ecological benefits. While facing moderate risks, the dam remains a key infrastructure for the local community and contributes to the sustainable use of water resources in Sawyer County, Wisconsin.