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Dickerson vicinity

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Chesapeake & Ohio Canal, Culvert 65, Martinsburg Road, Dickerson, Montgomery County, MD



See 26 maps of this location


Data Pages


Drawings


Item Title


Location
Martinsburg Road Vicinity, Dickerson vicinity, MD

Find maps of Dickerson, MD


Created/Published
Documentation compiled after 1968.

Notes
Survey number HAER MD-32
Unprocessed field note material exists for this structure (FN-14).
Building/structure dates: 1832 initial construction
Building/structure dates: 1924
Significance: Streams of intermediate size which flowed from the north into the Potomac were passed underneath the canal through culverts. There were over 200 culverts on the canal. Most culverts crossed under the canal bed at a right angle, but a handful were skewed, perhaps in response to the angle at which the stream approached. Culvert 65 was one of these skewed culverts. In addition to ensuring that only comprehensive stresses would be transferred from stone to stone, the designers of these skewed culverts had to satisfy two unusual conditions: (1) incomplete arches must be avoided at both head walls, which were parallel to the canal and hence, not normal to the barrel, (2) the stonework not exposed to public view should be easily fabricated. The solution was to place the base stone on the correct gradient to allow for free flow without silting, and then to lay the stones comprising the barrel of the culvert at a constant angle to the base. Following a single course from the beginning on one side of the culvert barrel to the end on the opposite side, one would see the courses "wrap around" the barrel. When viewed from within, the culvert has a "rifled" appearance. This design allowed the stone to be cut with easily fabricated right angles and parallel edges, and avoided the incomplete arches at either end. Culvert 65 makes an angle of about 67 with the longitudinal axis of the canal. The culvert barrel is semi-cylindrical, 12' in diameter, and 123' long. Construction was completed in 1832.

Subjects
Culverts


Collection
Historic American Engineering Record (Library of Congress)

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