Lock 21 “Swains” Campground

Campground near Travilah, Maryland (tagged tourism=camp_site).

Operator: National Park Service
Fee: No fee (tagged fee=no)
Reservations: No reservations (tagged reservation=no)
Capacity: not recorded in OpenStreetMap
Dump station on site: No (tagged sanitary_dump_station=no)
Water: not recorded in OpenStreetMap
Electrical hookups: not recorded in OpenStreetMap
Toilets: Yes (tagged toilets=yes)
Showers: not recorded in OpenStreetMap
Access: Public (tagged access=yes)
Website: https://www.nps.gov/choh/planyourvisit/camping.htm
Coordinates: 39.03110, -77.24439 (view on OpenStreetMap)

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Nearest RV dump station

RV dump station near Great Falls Crossing · 6.3 mi

Nearest campgrounds

Camp Fraser · Campground · 3.7 mi · near Great Falls
Marsden Tract Group Campsite · Campground · 4.0 mi · near Potomac · charges a fee
Robert C. McDonell Campground · Campground · 5.1 mi · near North Bethesda · charges a fee
Group camping area G-1 · Campground · 6.1 mi · near Great Falls Crossing · charges a fee
Lake Fairfax Park Large Group Campground · Campground · 6.2 mi · near Great Falls Crossing · charges a fee

All dump stations and campgrounds in Maryland

Source: OpenStreetMap way 411220571, data as of 2026-10-21. Map data © OpenStreetMap contributors (ODbL). Straight-line distances. The nearby city is the closest US Census Bureau place (1.97 mi away).