Rocky Branch Creek Watershed Site 4 in Jefferson, Iowa, is a local government-owned earth dam completed in 1962 by the USDA NRCS for fire protection, stock, and small fish pond purposes. Located in Rome, this dam on TR-Rocky Branch Creek has a height of 25 feet, a length of 453 feet, and a drainage area of 0.55 square miles, with a storage capacity of 113 acre-feet.

Managed by the Iowa DNR and regulated by the state, Rocky Branch Creek Watershed Site 4 is classified as having a low hazard potential and a moderate risk level. Although the condition assessment is not rated, the dam is subject to state permitting, inspection, and enforcement to ensure its safety and functionality. With a normal storage capacity of 18 acre-feet and a surface area of 3.8 acres, this dam plays a crucial role in flood risk reduction for the local community.

The dam's primary purpose, coupled with its strategic location along Rocky Branch Creek, underscores its importance in protecting the surrounding area from potential flooding events. With a history of federal involvement through the NRCS and ongoing state oversight, Rocky Branch Creek Watershed Site 4 serves as a vital infrastructure asset for water resource management and climate resilience in the region.