Crooked Creek R-1, also known as the Wohlers Structure, is a local government-owned dam located in Freeburg, Minnesota. Built in 1967 by the USDA NRCS, this Earth dam stands at 44 feet tall and stretches 480 feet in length, serving primarily for flood risk reduction along the Crooked Creek North Fork-TR. With a storage capacity of 363 acre-feet and a maximum discharge of 312 cubic feet per second, this dam plays a crucial role in managing water flow in the area.

Managed by the Minnesota Department of Natural Resources, Crooked Creek R-1 has a low hazard potential and is in satisfactory condition as per the last assessment in June 2017. The dam features an uncontrolled spillway, stone core, and soil foundation, with emergency action plans and risk assessments in place to handle any potential incidents. With a moderate risk rating, this dam is regularly inspected every 8 years to ensure its continued functionality and safety for the surrounding community.

As part of the St. Paul District under the USACE, Crooked Creek R-1 contributes to water resource management efforts in the region, showcasing the collaboration between federal and state agencies in safeguarding against floods and other water-related disasters. With its strategic location in Houston County, this dam serves as a vital infrastructure for maintaining water quality and protecting downstream areas from potential flooding events.