HistoricBridges.org Menu: HistoricBridges.org Menu:


We Recommend These Resources:
Bach Steel - Experts at historic truss bridge restoration.
Historic Bridge Finder App: Find Nearby Bridges

HistoricBridges.org: Bridge Browser

Long-Allen Bridge

Morgan City Bridge

Long-Allen Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: October 9, 2019

View Photos
and Videos
View Maps
and Links

Key Facts

Location
Berwick and Morgan City: St. Mary Parish, Louisiana: United States
Structure Type
Metal Rivet-Connected K-Truss 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
607.7 Feet (185.23 Meters)
Structure Length
3745 Feet (1141.48 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

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

View Historic Bridge Inventory Sheet For This Bridge

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.

Although Louisiana has released its Historic Bridge Inventory to the public, something that a number of states have not done, the inventory is sadly one of the worst inventories in the country, as each bridge evaluation is highly generic and provides almost no useful information beyond information already available in the National Bridge Inventory. To make matters worse, Louisiana did develop a number of historic bridge management plans. However, the bridges chosen were largely low significance bridges and relatively young bridges as well. This bridge, quite possibly one of the most historic bridges in the state, got no management plan whatsoever! The inventory also fails to mention any of the major reasons why this bridge is so significant. This bridge should be the pride of the state, it should be preserved and it deserves a full management plan. 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.

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.

Divider

Photo Galleries and Videos: Long-Allen Bridge

 
View Photo Gallery
Structure Overview
Original / Full Size Photos
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
View Photo Gallery
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

View Maps
and Links

Divider
 
Home Top

Divider

About - Contact

© Copyright 2003-2020, HistoricBridges.org. All Rights Reserved. Disclaimer: HistoricBridges.org is a volunteer group of private citizens. HistoricBridges.org is NOT a government agency, does not represent or work with any governmental agencies, nor is it in any way associated with any government agency or any non-profit organization. While we strive for accuracy in our factual content, HistoricBridges.org offers no guarantee of accuracy. Information is provided "as is" without warranty of any kind, either expressed or implied. Information could include technical inaccuracies or errors of omission. Opinions and commentary are the opinions of the respective HistoricBridges.org member who made them and do not necessarily represent the views of anyone else, including any outside photographers whose images may appear on the page in which the commentary appears. HistoricBridges.org does not bear any responsibility for any consequences resulting from the use of this or any other HistoricBridges.org information. Owners and users of bridges have the responsibility of correctly following all applicable laws, rules, and regulations, regardless of any HistoricBridges.org information.

Divider