Mosquito of Harrison Watershed Site 11-1-3a is a local government-owned earth dam located in Neola, Iowa, along TR- Spring Creek. Constructed in 1996 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock watering, small fish pond, and flood risk reduction. With a height of 32 feet and a length of 667 feet, the dam has a storage capacity of 45 acre-feet, making it an essential asset for managing water resources in the area.

Managed by the Iowa DNR, Mosquito of Harrison Watershed Site 11-1-3a has a low hazard potential and a moderate risk assessment rating. The dam is state-regulated and inspected regularly, ensuring its structural integrity and functionality. While the spillway type is uncontrolled, the dam has not experienced any significant issues or modifications since its completion. With a surface area of 3.2 acres and a drainage area of 0.18 square miles, this dam plays a crucial role in water management and conservation efforts in Harrison County, Iowa.

Water resource and climate enthusiasts will appreciate the strategic location and multi-purpose functionality of Mosquito of Harrison Watershed Site 11-1-3a. As a key component in the local water infrastructure, this dam not only provides essential services such as fire protection and stock watering but also contributes to flood risk reduction efforts. With its state-of-the-art design by the USDA NRCS and regular inspections by the Iowa DNR, this dam exemplifies effective water management practices and serves as a model for sustainable water resource development in the region.