West Lake Dam, located in Jamison, Iowa, is a significant earth dam completed in 1935 for water supply purposes. Owned by the local government and regulated by the Iowa Department of Natural Resources, the dam stands at a height of 58 feet and has a length of 1275 feet, creating a reservoir with a storage capacity of 9675 acre-feet. The dam's spillway type is uncontrolled with a width of 18 feet, serving the TR-South Squaw Creek.

With a drainage area of 9.84 square miles, West Lake Dam poses a significant hazard potential but is currently assessed as satisfactory in condition. The dam is inspected every 5 years, with the most recent assessment conducted in May 2017. Despite its moderate risk rating, the dam is designed to withstand potential emergencies, although there is no Emergency Action Plan (EAP) in place as of the last data update in April 2021. Overall, West Lake Dam remains a crucial water resource infrastructure in Clarke County, Iowa, ensuring a stable water supply for the surrounding area.