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Long-Allen Bridge

Morgan City Bridge

Long-Allen Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: October 9, 2019

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Key Facts

Location
Berwick and Morgan City: St. Mary Parish, Louisiana: United States
Structure Type
Metal Rivet-Connected K-Parker Through Truss, Fixed and Approach Spans: Concrete 16 Panel T-Beam, Fixed
Construction Date and Builder / Engineer
1933 By Builder/Contractor: Mount Vernon Bridge Company of Mount Vernon, Ohio

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
608 Feet (185 Meters)
Structure Length
3,745 Feet (1,141 Meters)
Roadway Width
24 Feet (7.32 Meters)
Spans
3 Main Span(s) and 42 Approach Span(s)
NBI Number
35100050100001

Historic Significance Rating (HSR)

Bridge Documentation

This bridge's long series of approach spans bring the roadway up to the elevation needed to cross the river, while three giant main through truss spans soar far above the roadway, making for an impressive bridge that is truly one of the most beautiful and significant historic bridges in the state. Each of this spans's three 607 foot main K-truss spans are the longest known K-truss spans in America. Indeed, these spans are among the longest simple span trusses of any configuration in the country. Spans in excess of 500 feet are rare, and represent major engineering achievements. Only a tiny number of truss bridges have spans ranging from 600 to just over 700 feet, which is the group this bridge falls into. The size of these spans and their beauty are hard to capture in photos, this is a bridge that truly has to be seen in person to fully experience how impressive it is. Louisiana is one of a small number of states that ever built bridges using the rare K-truss configuration. Some of the K-truss bridges that Louisiana built have been demolished; very few examples remain today. This bridge retains excellent historic integrity. There are no major alterations to the trusses, and the original railings remain in place with no modern additions. Original pedestrian stairways remain in place as well.

The Louisiana DOTD has in the past been a threat to the future of this bridge. In 2009, they threatened to demolish the bridge with no replacement claiming the nearby cantilever truss bridge was the only needed bridge for this area, and there was no reason (neither for historic preservation or utilitarian function) to keep the bridge standing and in use. This is a ridiculous position to take. This bridge should be the pride of the state, it should be preserved and it deserves a full restoration and long-term commitment to maintenance. Instead, it sits with a failing paint system that is more rust than paint today. This is shameful. It is not too late to rehabilitate and preserve this nationally significant historic bridge. When the bridge was threatened in 2009, thankfully, the St. Mary Parish Council and Morgan City Council stood up against plans for demolition. Beyond the bridge's national level of historic significance, these communities feel the bridge is an essential link during emergencies such as a hurricane evacuation. If the historic bridge were demolished any evacuation's success would rely on a single bridge only with no backup bridge. In this case, it would seem that preserving this historic bridge would also greatly increase safety for the community as well. The Louisiana DOTD needs to rethink its plans and move to fully restore this bridge.

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

View Historic Bridge Inventory Sheet For This Bridge

Above: Historical photo showing bridge construction. The bridge truss spans were assembled off-site then barged into place, an impressive feat for such large spans.

 Above: Historical photo of bridge.

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Photo Galleries and Videos: Long-Allen Bridge

 
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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. This gallery offers photos in the highest available resolution and file size in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
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Structure Details
Original / Full Size Photos
A collection of detail photos that document the parts, construction, and condition of the bridge. This gallery offers photos in the highest available resolution and file size in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Photo Gallery
Structure Overview
Mobile Optimized Photos
A collection of overview photos that show the bridge as a whole and general areas of the bridge. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Photo Gallery
Structure Details
Mobile Optimized Photos
A collection of detail photos that document the parts, construction, and condition of the bridge. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer

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Maps and Links: Long-Allen Bridge

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