Dorchester 4-A is a flood risk reduction structure located in Saline, Nebraska, along the TR-W FK BIG BLUE RIVER. Built in 1969 by the USDA NRCS, this earth dam stands at a height of 30 feet and has a structural height of 34 feet. With a storage capacity of 368 acre-feet and a drainage area of 1.3 square miles, Dorchester 4-A plays a crucial role in managing water flow and reducing the risk of flooding in the area.

Managed by the local government and regulated by the NE DNR, Dorchester 4-A is equipped with state permitting, inspection, and enforcement processes to ensure its safety and functionality. The dam's hazard potential is classified as low, with a satisfactory condition assessment as of April 2019. Despite its age, Dorchester 4-A continues to serve its primary purpose effectively, demonstrating the importance of proper maintenance and oversight in water resource management.

As a key component in the flood risk reduction infrastructure of the area, Dorchester 4-A plays a vital role in protecting the local community from potential water-related hazards. With its strategic location and design, this earth dam stands as a testament to the collaborative efforts between government agencies and designers in safeguarding water resources and mitigating the impacts of climate variability.