Located in Union, Iowa, East Fork Grand River Watershed Site A-31 is a flood risk reduction structure designed by the USDA NRCS and completed in 2005. This earth dam stands at a height of 21 feet and stretches 675 feet in length, with a storage capacity of 79 acre-feet. Situated on TR- Squaw Creek, this site is regulated by the Iowa DNR and is subject to state permitting, inspection, and enforcement.

With a low hazard potential and a moderate risk assessment rating, East Fork Grand River Watershed Site A-31 plays a crucial role in managing flood risk in the area. The dam has not been rated for its condition assessment, but it meets state regulatory requirements for operation and maintenance. Despite its uncontrolled spillway type, the structure has proven effective in reducing the risk of flooding in the region.

For water resource and climate enthusiasts, East Fork Grand River Watershed Site A-31 offers a fascinating glimpse into the intersection of infrastructure and environmental conservation. As part of the broader efforts to mitigate flood risks and protect local communities, this structure stands as a testament to the importance of sustainable water management practices. Its location in the Rock Island District and its association with the Natural Resources Conservation Service highlight the collaborative efforts involved in safeguarding our water resources for future generations.