Montgomery CO State Park Lake, also known as Montgomery County State Lake Dam, is a state-owned water resource located in Coffeyville, Kansas. Built in 1953 by Wilson and Company, this dam stands at a height of 44 feet and has a hydraulic height of 38 feet, with a storage capacity of 1,600 acre-feet. The dam is situated on Coal Creek and serves as a low hazard potential structure with a condition assessment of "Not Rated."

With a maximum discharge of 7,500 cubic feet per second, Montgomery CO State Park Lake offers recreational opportunities such as fishing, boating, and wildlife observation in the surrounding area. Managed by the Kansas Department of Agriculture, this dam is state-regulated and regularly inspected to ensure safety and compliance with regulatory standards. Despite being last inspected in 1992, the dam's low hazard potential indicates a low risk of failure, providing water resource and climate enthusiasts with a serene location to enjoy nature and the outdoors in Montgomery County, Kansas.