Stump Lake in Middleton, Iowa, is a federally owned reservoir managed by the US Army for recreation purposes. Completed in 1941, this earth dam stands at 29 feet tall and spans 1025 feet in length, with a storage capacity of 650 acre-feet. The reservoir covers an area of 11 acres and is located on Long Creek, a tributary of the Des Moines River, in Des Moines County.

Despite its low hazard potential, Stump Lake is subject to regular inspections by the US Army to ensure its safety and structural integrity. The dam features an uncontrolled spillway and is surrounded by rock foundations for added stability. While the condition assessment is currently not available, the risk assessment for the dam is considered moderate, with a risk rating of 3 out of 5.

Water resource and climate enthusiasts visiting Stump Lake can enjoy various recreational activities such as fishing, boating, and wildlife watching in a picturesque natural setting. With its tranquil waters and scenic surroundings, Stump Lake offers a peaceful escape for outdoor enthusiasts seeking to immerse themselves in the beauty of Iowa's natural landscapes.