Flannagan Reservoir is a 1,143-acre impoundment located in Dickenson County. The reservoir was built to provide flood control, pollution abatement, fish and wildlife habitat, and recreational opportunities. The U.S. Army Corps of Engineers completed construction of the dam and project in 1964. The project was named for Ninth District Congressman John W. Flannagan.
Fifty miles of beautiful shoreline consisting of mature hardwood forest interspersed with spectacular rock bluffs surround this deep, clear reservoir. At full pool elevation of 1396 feet above sea level, the lake has a maximum depth of 166 feet and an average depth of 58 feet. During the summer and fall the lake is incredibly clear, with visibility often exceeding 20 feet. The lake level fluctuates about 16 feet per year. The lake is drawn down to winter pool during October and November, and is typically returned to summer pool in April.
Flannagan Reservoir is home to a variety of sportfish species including: largemouth and smallmouth bass, walleye, hybrid striped bass, channel catfish, flathead catfish, crappie, bluegill, rock bass, common carp and musky. Alewives and gizzard shad provide forage for the sportfish populations.