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Mechanic Falls Bridge

   


Mechanic Falls Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: June 15, 2012
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Key Facts

Location
Mechanic Falls: Androscoggin County, Maine
Construction Date and Builder / Engineer
1949 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
1984
Main Span Length
64 Feet (19.5 Meters)
Structure Length
189 Feet (57.6 Meters)
Roadway Width
28 Feet (8.5 Meters)
Spans
1 Main Span(s)
NBI Number
2540

Historic Significance Rating (HSR)

Bridge Documentation

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

This bridge is an unusual multi-span continuous reinforced concrete slab. The slab has a variable depth (arched) design, which has the side effect of giving an otherwise visually unappealing structure type some aesthetic quality. Original railings remain on the bridge.

Information and Findings From Maine's Historic Bridge Inventory

Discussion of Bridge

The 1949 rigid frame bridge is historically and technologically significant as a complete example of a continuous rigid frame bridge. It is the longer and more complete of the two examples built by the MSHC in the late 1940s. It represents important advances in engineering knowledge and strength of materials in the postwar period. Rigid frame bridges for 35' to 85' span lengths became common in Maine during the 1930s, but multiple span application required difficult and sophisticated stress analysis because of the indeterminate nature of rigid frame structures, and they were rarely attempted until the 1940s. The bridge is judged to have high preservation priority because it is the most significant, extant example of its type/design.

Bridge Considered Historic By Survey: Yes

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