South Branch 27 is a local government-owned earth dam located in Brock, Nebraska, along the TR-S FK Little Nemaha River. Built in 1994 by the USDA NRCS, this dam serves the primary purpose of flood risk reduction and stands at a height of 30 feet with a length of 1055 feet. With a maximum storage capacity of 1094 acre-feet and a normal storage of 163 acre-feet, the dam covers a surface area of 36 acres and has a drainage area of 3.7 square miles.

Managed by the Nebraska Department of Natural Resources, South Branch 27 is regulated, inspected, and enforced by the state agencies to ensure its structural integrity and compliance with safety standards. The dam has a satisfactory condition assessment as of June 2016 and a low hazard potential. Despite its low hazard potential, the dam undergoes inspections every 5 years to ensure its continued safety and effectiveness in flood risk reduction. With its strategic location and design, South Branch 27 plays a crucial role in protecting the surrounding community from potential flooding events in the area.