Cabin John in Montgomery County, Maryland — The American Northeast (Mid-Atlantic)
Drop Gate Locks
Photographed By Allen C. Browne, May 3, 2017
1. Drop Gate Locks Marker
The “drop gate” on this lift lock was a technological advance over the more common swing-gate lock. It was faster and could be more easily operated by a single employee.
Only a few drop-gates were installed on the canal, most of them to speed traffic here at Seven Locks where it often took boatmen an hour or more to lock through.
Topics and series. This historical marker is listed in this topic list: Waterways & Vessels. In addition, it is included in the Chesapeake and Ohio (C&O) Canal series list.
Location. 38° 58.334′ N, 77° 10.119′ W. Marker is in Cabin John, Maryland, in Montgomery County. Marker can be reached from Clara Barton Parkway. At lock 10 in the Chesapeake & Ohio Canal National Historical Park. Touch for map. Marker is in this post office area: Cabin John MD 20818, United States of America. Touch for directions.
Other nearby markers. At least 8 other markers are within 2 miles of this marker, measured as the crow flies. At All Hours (a few steps from this marker); Lockhouse 10 (within shouting distance of this marker); Swing-Gate Locks (approx. 0.2 miles away); The Lock-Keepers
this page online
Photographed By Allen C. Browne, May 3, 2017
2. Drop Gate Locks Marker
Photographed By Allen C. Browne, May 3, 2017
3. Locking Through
Photographed By Allen C. Browne, May 3, 2017
4. Butterfly Gates
Two levers were used to open butterfly gates at the bottom of the lock to equalize water levels.Close-up of image on marker
Photographed By Allen C. Browne, May 3, 2017
5. Opening the Gate
The gate could then be opened by turning a spoked wheel.Close-up of image on marker
Photographed By Allen C. Browne, May 3, 2017
6. Gate Open
Credits. This page was last revised on September 28, 2020. It was originally submitted on May 4, 2017, by Allen C. Browne of Silver Spring, Maryland. This page has been viewed 251 times since then and 56 times this year. Photos: 1, 2, 3, 4, 5, 6. submitted on May 4, 2017, by Allen C. Browne of Silver Spring, Maryland. • Bill Pfingsten was the editor who published this page.
