Lock 21 “Swains” Campground
Lock 21 “Swains” Campground is a free campsite in Maryland. It is listed as free to stay.
- Type
- Free campsite
- Location
- Maryland
- Coordinates
- 39.03110, -77.24439
- Nightly fee
- Free
- Land status
- allowed
- Map
- Open in OpenStreetMap
- Website
- www.nps.gov/choh/planyourvisit/camping.htm
Amenities
- Toilets
Only amenities a source confirms are listed; an amenity missing here is unknown, not absent.
Cell coverage
No coverage data for this location yet.
Nearby RV services
- Dump station
- Maryland Department of Natural Resources · 35 mi
- Water fill
- None mapped within 50 mi
- Propane
- Exxon · 3.3 mi
- Low clearances
- 28 bridges or tunnels at 14 ft or less within 10 mi
Other places to stay nearby
| Name | Type | Distance | Fee | Hookups |
|---|---|---|---|---|
| Swains Lock Hiker-Biker Campsite | National park campground | under 0.1 mi | — | — |
| Camp Fraser | Private campground | 3.7 mi | — | — |
| Marsden Tract Group Campsite | National park campground | 3.9 mi | — | No hookups |
| Marsden Tract Group Campsite | Free campsite | 4.0 mi | Free | — |
| Carderock Recreation Area Pavilion | National park campground | 4.8 mi | — | No hookups |
| Robert C. McDonell Campground | Free campsite | 5.1 mi | Free | — |
Open Lock 21 “Swains” Campground in DryRig
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Sources. OpenStreetMap contributors. Updated June 2026. Facility facts only; DryRig does not publish ratings or reviews on this page.
Contains information from © OpenStreetMap contributors, available under the Open Database License (ODbL).