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Occoquan Bay National Wildlife Refuge: Wikis


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Coordinates: 38°38′39″N 77°14′09″W / 38.64417°N 77.23583°W / 38.64417; -77.23583

The Occoquan Bay National Wildlife Refuge is a National Wildlife Refuge located where the Occoquan River meets the Potomac River in Woodbridge, Virginia, United States. The 644-acre (2.61 km2) site, about half of which is wetlands, was used for military research by the U.S. Army's Harry Diamond Laboratories from the 1960s to the 1990s. The refuge, established in 1998, is now run by the United States Fish and Wildlife Service as part of the Potomac River National Wildlife Refuge Complex.

Geography and biodiversity

When the Army obtained the site in 1950, for a radio transmitting station, fields of antennas replaced cows and crops. In the 1970’s, the base’s mission shifted to top secret research. Electromagnetic pulse testing and sight lines for security kept the vegetation low, primarily in grasslands. When the base closed in the 1990’s, the U.S. Fish and Wildlife Service was able to continue to preserve these grasslands that had nurtured wildlife for so long.

The refuge has a mix of wetlands, forest, and native grasslands that provides a diversity of habitats for wide variety of species. Wetland habitats cover about 50% of the refuge and include wet meadows, bottomland hardwoods, open freshwater marsh, and tidally influenced marshes and streams. Upland meadows and mature oak-hickory-beech forest are interspersed among the wetlands. The unusual number and interspersion of habitats provides visitors an opportunity to view a wide variety of wildlife species and habitats in a relatively small area. Noted for its grassland nesting birds, neo-tropical migrants and raptors, the refuge also hosts wildlife common to Virginia. Over 220 species of birds, over 600 species of plants, and 65 species of butterflies have been documented on the refuge. Many of the bird species are uncommon or rare in the region.


Approximately 4 miles of old patrol roads are reserved for foot traffic, rotating between 3 two-mile loops. Information is posted at the visitor contact station and at trail heads. Wildlife Drive-2 miles of old patrol roads are reserved for motor vehicle and bicycle access. Vehicles can be a mobile blind, allowing visitors closer views. The blind effect is also why drivers and passengers must stay in their vehicles while on the drive.

There is a small entrance fee for anyone entering, by vehicle, bicycle, or on foot.

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