Speltz Pond, also known as Louis Rinn Detention, is a privately owned water structure located in Rollingstone, Minnesota. Designed by the USDA NRCS, this dam was completed in 1959 with a primary purpose of flood risk reduction. With a height of 23 feet and a hydraulic height of 25 feet, this earth dam spans 310 feet and has a storage capacity of 13.5 acre-feet.

The pond serves multiple purposes including fire protection, stock or small fish pond, flood risk reduction, and recreation. Situated on the TR-Speltz Creek, this significant water resource has a spillway width of 15 feet and a maximum discharge of 104 cubic feet per second. Despite its moderate risk assessment, the dam's condition assessment is currently not rated, with no recent inspection dates available.

Overall, Speltz Pond plays a crucial role in managing water flow and reducing flood risks in the area. With a unique history dating back to 1959, this privately owned water structure continues to serve the community of Rollingstone, Minnesota, while providing recreational opportunities and essential water management services.