Lock 21: Swains Lock

Historic site · Potomac, MD

Chill · 1 of 5Sit back, stroll, take it in.

All agesOutdoor

Directions Add to a plan

Good to know

Address: Potomac, MD
Area: Montgomery County, Maryland
Maps: Apple Maps · OpenStreetMap

More nearby

Lock 21 “Swains” CampgroundCamping · PotomacEasyAll agesOutdoorunder 0.1 mi
Riverbend Park Nature CenterAttraction · Great FallsChillAll agesIndoor & outdoor0.7 mi
Riverbend ParkNature area · Great FallsEasyAll agesOutdoor1.0 mi
Saints Peter and Paul Antiochian Orthodox Christian Church playgroundPark · PotomacChillAll agesOutdoor1.4 mi
Adventure Conservation ParkNature area · PotomacEasyAll agesOutdoor1.6 mi
Kilgour Branch Stream Valley ParkNature area · PotomacEasyAll agesOutdoor1.9 mi

Source and freshness

Place details come from OpenStreetMap (way/137400975), © OpenStreetMap contributors, under the Open Database License (ODbL) 1.0.
Last checked against the source on Nov 13, 2026.
The adrenaline level and audience are our editorial rating for this type of activity, not a measurement. Confirm hours, prices and age limits with the venue before you go.
Spotted a mistake? Fix it on OpenStreetMap and it will flow here on the next refresh.

Cite this page: ActivityPlaces, “Lock 21: Swains Lock, Potomac, MD”, https://www.activityplaces.com/place/lock-21-swains-lock-potomac-md (data checked Nov 13, 2026).