Somerville Lake is a U.S. Army Corps of Engineers reservoir on Yegua Creek in the Brazos River basin, 10 miles (16 km) northwest of Brenham, Texas, USA. The town of Somerville in Burleson County is adjacent to the reservoir. The lake extends into portions of Burleson County, Washington County, and Lee County. The dam lies in Washington County. The dam and lake are managed by the Fort Worth District of the U.S. Army Corps of Engineers. The reservoir was officially impounded in 1967, and serves to provide flood control and water for irrigation for the communities downstream.