Mill Picayune Watershed Site M-35-1 in Crawford County, Iowa, is a significant earth dam completed in 1984 for purposes including fire protection, stock, small fish pond, and flood risk reduction. Managed by the USDA NRCS, this dam has a height of 37 feet and a length of 636 feet, with a storage capacity of 134 acre-feet. The watershed site is located in Manteno, along the Bee Tree Creek, and falls under the jurisdiction of the Iowa DNR for regulation, permitting, inspection, and enforcement.

With a hazard potential rated as significant and a moderate risk assessment score of 3, the Mill Picayune Watershed Site M-35-1 plays a crucial role in water resource management and climate resilience in the region. The dam's primary purpose of providing fire protection and supporting agricultural activities underscores its importance for the local community. While the condition assessment is currently not rated, the dam's structural integrity and functionality are essential for safeguarding against potential flooding events and ensuring the sustainable utilization of water resources in the area.

As a key feature in the Rock Island District managed by the Natural Resources Conservation Service, the Mill Picayune Watershed Site M-35-1 serves as a critical infrastructure for water storage and management in Crawford County. Its strategic location, design, and operational aspects highlight its significance in enhancing water security, agricultural productivity, and overall environmental resilience in the region. With continued monitoring, maintenance, and adherence to regulatory guidelines, this watershed site will continue to contribute to sustainable water resource management and climate adaptation efforts in Iowa.