Swing-Gate Locks

Swing-Gate Locks (HM2CJK)

Location: Cabin John, MD 20818 Montgomery County
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Country: United States of America
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N 38° 58.337', W 77° 10.306'

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Most canal locks were "swing-gate" locks, opened by pulling or pushing long balance beams that projected from the gates.

Stone for the Seven Locks (locks 7 through 14) was cut and finished by stonemasons who were paid by the "piece." Arrows, pine trees, hourglasses, and other signs marked their work for the paymaster. Some of their marks can still be seen in the lock masonry.

The lock chamber was filled or emptied by opening small butterfly gates — called "paddles" — at the bottom of each wooden lock gate. This was done by turning long metal rods, or "stems." Boats going up canal to Cumberland entered the lower level and were lifted eight feet. Boats going down entered a filled lock chamber and were slowly lowered, a job that took about ten minutes.
Placed ByNational Park Service, U.S. Department of the Interior
Marker ConditionNo reports yet
Date Added Sunday, October 21st, 2018 at 5:02pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)18S E 311860 N 4315944
Decimal Degrees38.97228333, -77.17176667
Degrees and Decimal MinutesN 38° 58.337', W 77° 10.306'
Degrees, Minutes and Seconds38° 58' 20.22" N, 77° 10' 18.36" W
Driving DirectionsGoogle Maps
Area Code(s)301
Which side of the road?Marker is on the right when traveling East
Closest Postal AddressAt or near 6410 83rd Pl, Cabin John MD 20818, US
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