Do / Potomac / Historic site
Lock 21: Swains Lock
Historic site
Potomac, Maryland
What the source states
The source does not state whether this place is free, indoor or outdoor, or suited to kids or dogs, so we do not guess.
Source
- From
- OpenStreetMap contributors
- Licence
- ODbL 1.0
- Checked
- Nov 13, 2026
- Location
- 39.03122, -77.24347 (approximate point)
Hours and fees are not listed here: check the official page before you go.
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Independent project, not affiliated with Montgomery County Government. Distances are straight-line.