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Lisbon Falls Bridge

Durham Bridge

   


Lisbon Falls Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: June 16, 2012
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Key Facts

Facility Carried / Feature Intersected
Canal Street (ME-9 and ME-125) Over Androscoggin River
Location
Lisbon Falls: Androscoggin County, Maine
Structure Type
Metal Continuous Rivet-Connected Polygonal Warren Through Truss, Fixed and Approach Spans: Metal Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
1936 By Builder/Contractor: American Bridge Company of New York, New York and Engineer/Design: Max L. Wilder, Maine State Highway Commission

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
168 Feet (51.2 Meters)
Structure Length
362 Feet (110.3 Meters)
Roadway Width
22 Feet (6.7 Meters)
Spans
2 Main Span(s) and 1 Approach Span(s)
NBI Number
3334

Historic Significance Rating (HSR)

Bridge Documentation

This Bridge's Future Is At Risk!

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

This bridge is one of only three known examples of continuous trusses in Maine that display the appearance of a very long simple span truss supported by piers. In this design, the truss has no "cantilever truss shape." Continuous trusses of this design are also extremely rare nationwide. Each of Maine's three examples of this design are distinctly unique, each employing different truss arrangements. Despite that fact, all three were built at around the same time. It is unknown why there is such a variance in design.  The other two bridges are the West Buxton Bridge and the Bar Mills Bridge. Because each bridge is rare, both in Maine and nationwide, and given the unique appearance of each, the preservation of each example should be given a high priority. The Lisbon Falls Bridge is perhaps the most unusual of these three continuous truss bridges.

The Lisbon Falls Bridge has two truss spans (as opposed to the West Buxton and Bar Mills Bridges which have three spans). What is most unusual about the Lisbon Falls Bridge is that it is asymmetrical. The single pier is not located at the center of the bridge; the southern truss span is significantly shorter than the northern truss span. Another unusual feature is the stringer approach span at the northern end. East of the bridge, the road makes an immediate 90 degree turn to the west. To accommodate this sharp turn, the stringer span is flared, being noticeably wider at the northern end than the southern end. This is visible just by looking at the roadway, but is also vivid when viewing the stringers under the bridge. The stringer span passes over an enormous boulder or rock outcropping along the river bank.

The previous bridge at this location is documented in postcards. It consisted of two simple truss spans. Each span rested on an extremely large stone pier that was long enough that is separated the spans, making them look like two bridges. One span was a double-intersection Warren through truss, while the other was a smaller Warren truss. The bridge was destroyed in a flood, and the bridge seen today was the replacement bridge.

Information and Findings From Maine's Historic Bridge Inventory

Discussion of Bridge

The 1936, continuous, riveted, Warren thru truss bridge is technologically significant as an early application of the continuous design. The first examples in Maine were for replacements of bridges lost in the flood of March, 1936. This is one of 25 bridges built by MSHC to replace lost bridges, and it is one of three continuous-design Warren truss bridges built by the commission in 1936-37 as flood replacement bridges. All three early examples, including #3340 and #3333, are historically and technologically significant. The significance of the bridge is linked to the continuous design. The bridge crosses the river at a 90-degree angle to the highways that parallel the river.

The bridge is judged to have average preservation priority because an example of a bridge type that is considered common in the state.

Bridge Considered Historic By Survey: Yes

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Photos and Videos: Lisbon Falls Bridge

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Structure Details
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A collection of detail photos that document the parts, construction, and condition of the bridge. For the best visual immersion and full detail, or for use as a desktop background, this gallery presents the photos for this bridge in the original digital camera resolution.
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Structure Overview
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A collection of overview photos that show the bridge as a whole and general areas of the bridge. View the photos for this bridge in a reduced size which is useful for mobile/smartphone users, modem (dial-up) users, or those who do not wish to wait for the longer download times of the full-size photos. Alternatively, view this photo gallery using a popup slideshow viewer (great for mobile users) by clicking the link below.
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View Photo Gallery
Structure Details
Mobile Optimized Gallery
A collection of detail photos that document the parts, construction, and condition of the bridge. View the photos for this bridge in a reduced size which is useful for mobile/smartphone users, modem (dial-up) users, or those who do not wish to wait for the longer download times of the full-size photos. Alternatively, view this photo gallery using a popup slideshow viewer (great for mobile users) by clicking the link below.
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