Somervillebr/Burleson County, Texasbr/30 20.166' N 96 32.382' Wbr/Directions: Start at the intersection of Thornberry Drive and 8th Street. The marker is on the west side of the intersection.br/ br/Text: First shovel of earth for Somerville Dam was turned Sept. 22, 1962, by Lyndon Johnson, then vice president of United States. Dam was built to control flooding on Yegua Creek. In the 46 years prior to 1958, Yegua has flooded 43 times, costing lives, crops. Project was finished 1967.