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Crow Rock Road Bridge

Crow Rock Road Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: July 9, 2008

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Key Facts

Facility Carried / Feature Intersected
Crow Rock Road Over Middle Creek
Rural: Frederick County, Maryland: United States
Construction Date and Builder / Engineer
1897 By Builder/Contractor: Groton Bridge Company of Groton, New York

Technical Facts

Rehabilitation Date
Main Span Length
75 Feet (22.9 Meters)
Structure Length
80 Feet (24.4 Meters)
Roadway Width
12.8 Feet (3.9 Meters)
1 Main Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

View The Historic Bridge Inventory Report For This Bridge

This bridge is a small pony truss with a special attraction, which is the top-chord-mounted builder plaque. Groton Bridge Company was the builder, and this company was noted for doing this on its pony truss bridges. The plaque stands out and is more decorative in this fashion.

 As the road's name suggests, this is a rocky area. The bridge sits on stone abutments, but part of one of the abutments is actually a natural and undisturbed rock outcropping upon which the bridge was placed, adding to the interest of the bridge. For all the criticism historians give the period in which this bridge was built for polluting and destroying the environment, bridge erection itself in this period was often done in harmony with nature. Bridges were often built to cross the river at the easiest or shortest point, and bridges might have an odd angle to the approaching roadway to meet this goal. Natural materials might be used, whether cementing rubble together to form an abutment, or as in the case of this bridge, using a natural rock outcropping for the abutment. Today, if the bridge was replaced, engineers and contractors would blast all this natural rock apart, tear out all the trees and half the river bank, and build a big concrete abutment.

However, Frederick Count instead rehabilitated this bridge, setting an example for other locations to follow. While some integrity was lost, notably in the replacement of floorbeams, the trusses retain integrity and the overall appearance of the structure remains historic and attractive.


Photo Galleries and Videos: Crow Rock Road Bridge

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Maps and Links: Crow Rock Road Bridge

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