Lake Bryan is a census-designated place (CDP) in Brazos County, Texas, United States, situated around a reservoir of the same name managed by Bryan Texas Utilities. The population was 1,728 at the 2010 census. It is part of the Bryan–College Station metropolitan area.GeographyLake Bryan is located along the northwest border of Brazos County. It is bordered to the southeast by the city of Bryan and to the northwest by Robertson County. U.S. Route 190 forms the northeastern edge of the CDP, leading southeast around Bryan and northwest to Hearne.According to the United States Census Bureau, the CDP has a total area of 26.4km2, of which 23.7sqkm is land and 2.7sqkm, or 10.15%, is water.