Terrebonne Parish Road No. 004 Bridge, Carries Parish Road 111 over Bayou Du Large, Theriot, Terrebonne Parish, LA

Significance: The Terrebonne Parish Road No. 004 Bridge is a cable-stayed swing bridge that has significance as an important example of a movable bridge. Its significance is demonstrated by the presence of distinctive engineering and design features of a cable-stayed swing bridge, which is characterized by a truss swing span, center-bearing turning mechanism, pivot pier, and tower structure above the pivot pier with cables that support the bridge in open position. A strengthening member has been welded to the top chord of the trusses that results in a minor loss of integrity, but the bridge continues to convey significant design features of the cable-stayed swing bridge type. This bridge was determined eligible for listing in the National Register of Historic Places in 2013 under
Criterion C: Design/Engineering at the state level of significance.
Survey number: HAER LA-35
Building/structure dates: 1959 Initial Construction