Joseph V. Gartlan Jr. Great Marsh Trail Federal
The Great Marsh, on the tidal Potomac
Three quarters of a mile, paved and accessible, ending at an observation platform over a 250 acre marsh. The refuge itself says this trail gives the best opportunity to see bald eagles and wintering waterfowl, and the accessibility matters: very few sites in this inventory can be reached without a walk over rough ground.
Run by US Fish and Wildlife Service, Elizabeth Hartwell Mason Neck National Wildlife Refuge

