Jasper County Roadgrade Dam 35-81-17, located in Rock Creek State Park in Jasper County, Iowa, is a local government-owned structure designed by Michael Olsen, Co. Engr. The dam, completed in 2001, serves a primary purpose of "Other" with a height of 28 feet and a length of 750 feet. It has a normal storage capacity of 20 acre-feet and a maximum storage of 110 acre-feet, covering a surface area of 4.2 acres and draining a 0.38 square-mile watershed.

Managed by the Iowa Department of Natural Resources (DNR), Jasper County Roadgrade Dam 35-81-17 is regulated, inspected, and enforced by state authorities to ensure its safety and compliance with regulations. The dam, classified as an Earth type with a stone core and soil foundation, has a low hazard potential and a moderate risk assessment score of 3. While the dam has not been rated for condition assessment, it meets guidelines for emergency action plans and risk management measures.

Despite its uncontrolled spillway type and lack of outlet gates, Jasper County Roadgrade Dam 35-81-17 poses a low risk to the surrounding area. With its strategic location in Rock Creek State Park and close oversight by state regulatory agencies, the dam stands as a testament to responsible water resource management in Jasper County, Iowa.