Long–Allen Bridge (Jonesville)

The Long–Allen Bridge, also known as the Jonesville Bridge, is a historic bridge spanning the Ouachita River between Jonesville and Harrisonburg in Catahoula Parish, Louisiana. It is a cantilevered Warren truss bridge, a type of bridge characterized by its use of diagonal members forming triangles to distribute weight and stress. The bridge is notable for its significant length and the cantilever construction method employed, which allowed for construction to proceed outwards from piers without requiring temporary supports from below for the main span.

The original bridge at this location, also known as the Long–Allen Bridge, was a ferry system. Construction of the cantilevered Warren truss bridge began in the late 1930s and was completed in the early 1940s. It served as a vital transportation link for the region, facilitating commerce and travel across the Ouachita River.

Over time, the bridge faced deterioration due to age and increased traffic loads. Eventually, a new, modern bridge was constructed parallel to the original. The original Long–Allen Bridge was subsequently closed to vehicular traffic and is now primarily used for pedestrian and bicycle access. Its historic significance lies in its engineering design and its role in the development of transportation infrastructure in the area. The bridge stands as an example of a specific type of bridge construction prevalent in the mid-20th century and is a landmark within the community. Further historical details and preservation efforts can often be found through local historical societies and government transportation agencies.