Occoquan Reservoir is a 2,100-acre Fairfax Water Authority impoundment, which forms the boundary between Fairfax and Prince William counties. Fairfax County Water Authority manages Occoquan as a water supply impoundment, which serves residents of Fairfax County and the City of Alexandria. Occoquan is located near the I-95 corridor and is readily accessible to anglers residing in the Northern Virginia area. Three developed marinas provide boat rentals, bait, tackle, food, and boat launching facilities.
The Department initiated fish management activities in 1961, and management continues today for largemouth bass, bluegill, black and white crappie, channel catfish, flathead catfish, northern pike, and white perch. Hybrid striped bass and walleye were stocked in the past but introductions have since been discontinued. Northern pike were stocked in 2001 and should provide a trophy element for anglers in the future. Occoquan currently holds the stated record flathead catfish (66 lbs. 4 oz) caught and released in 1994. Currently, the largemouth bass fishery is ranked number one in the district for Catch Per Unit Effort (CPUE) of preferred fish (greater than 15 inches).