• Aerial view of the George Washington Memorial Parkway in the fall

    George Washington

    Memorial Parkway DC, MD, VA

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  • Lane Closures for Bridge Inspections

    Workers will close lanes of the George Washington Memorial Parkway while they inspect the Theodore Roosevelt Bridge on October 20 and the Metro bridge near I-395 on October 23. All lanes will be open during morning and afternoon rush hours. More »

  • Multiple Closures during Marathon on Sunday, October 26th

    Please visit the "Closures & Construction" page for more detailed information and for a list of alternate routes for the G.W. Parkway northbound from Rt. 50 to Rt. 123. More »


Most of the crustacean inventories at GWMP have focused on amphipods, thus little is known of the other crustacean species that likely occur here. Nine species of amphipod and two species of Caecidotea isopod have been documented from GWMP. One of the amphipods found within GWMP is a species new to science, currently known as Stygobromus sp. 15, until it is given a species epithet. The other eight species of amphipods known from GWMP are Crangonyx shoemakeri, Crangonyx stagnicolous, Crangonyx palustris, Synurella chamberlaini, Gammarus fasciatus, Gammarus minus, Stygobromus pizzinii, and Stygobromus tenuis. A Grass Shrimp (Palaemonetes sp.) is occasionally found in Dyke Marsh. Eighteen species of copepod have been documented within GWMP. Two non-native crayfish, the Red Swamp Crayfish (Procambarus clarkii) and the Virile Crayfish (Orconectes virilis), and three native species, the Devil Crayfish (Cambarus diogenes), Appalachian Brook Crayfish (Cambarus bartonii) and Spiny-checked Crayfish (Orconectes limosus) have been found in streams and wetlands of GWMP.

Did You Know?

Stained glass windows in Clara Barton's house.

The home of Clara Barton, the founder of the American Red Cross, has over thirty rooms and nearly fifty closets. More...