Chesapeake & Ohio Canal, Stop Lock at Dam No. 4, 85.62 miles above tidewater, Sharpsburg, Washington County, MD
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85.62 miles above tidewater, Sharpsburg vicinity, MD
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Documentation compiled after 1933.
Survey number HABS MD-223
Unprocessed field note material exists for this structure (FN-123).
Building/structure dates: 1835 initial construction
Significance: The Stop Lock at Dam Number Four served to prevent back flooding of the canal above the dam during periods of high water and also served to prevent the loss of water from the canal during emergencies below the dam, both of these being accomplished by the lowering of a temporary timber gate into the canal bed. Only the abutments remain at the present time, the frame windless shed, previously recorded by H.A.B.S., has since been removed. The Stop Lock was probably completed prior to 1835 as the canal was in operation to a point above Dam Number Four by that date.
"Mission 66" Program
Locks (hydraulic Facilities)
Bobrow, Michael L., Field Team
Harris, William T., Field Team
McDonald, Alan R., Field Team
Wormuth, C. Gustave, Field Team
Carter, Donn, Delineator
Hanna, John H., Delineator
Historic American Buildings Survey (Library of Congress)
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