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“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Cabin John in Montgomery County, Maryland — The American Northeast (Mid-Atlantic)
 

Drop Gate Locks

 
 
Drop Gate Locks Marker image. Click for full size.
By Allen C. Browne, May 3, 2017
1. Drop Gate Locks Marker
Inscription. 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.
 
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. Touch for map. At lock 10 in the Chesapeake & Ohio Canal National Historical Park. Marker is in this post office area: Cabin John MD 20818, United States of America.
 
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); Cabin John (approx. one mile away); Early Blacksmith Shop (approx. 1.5 miles away); A Life of Service (approx. 1.5 miles away); Clara Barton House (approx. 1.5 miles away); A Heroine's Home (approx. 1.5 miles away); “A riotous country jumble” (approx. 1.6 miles away). Touch for a list and map of all markers in Cabin John.
 
Categories. Man-Made FeaturesWaterways & Vessels
 
Drop Gate Locks Marker image. Click for full size.
By Allen C. Browne, May 3, 2017
2. Drop Gate Locks Marker
Locking Through image. Click for full size.
By Allen C. Browne, May 3, 2017
3. Locking Through
Close-up of image on marker
Butterfly Gates image. Click for full size.
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
Opening the Gate image. Click for full size.
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
Gate Open image. Click for full size.
By Allen C. Browne, May 3, 2017
6. Gate Open
Close-up of image on marker
 
 
Credits. This page was last revised on May 4, 2017. This page originally submitted on May 4, 2017, by Allen C. Browne of Silver Spring, Maryland. This page has been viewed 65 times since then. 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.
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