SCIENCETECH · HISTORICAL MARKER
Brazos River Bridge
Science & Tech
3
Built in 1938-39 on State Highway 6 south of Benjamin, this bridge replaced a deteriorated 1901 crossing over the Brazos River and linked the Knox County seat to points south. A statewide historic bridge survey in the 1990s identified it as one of only five continuous through truss bridges in Texas built before World War II. Its design features a three-span continuous truss unit measuring 382 1/2 feet, flanked by two simply supported truss spans 96 feet long, with three steel I-beam approach spans on the south side and two on the north. The truss spans rest on reinforced concrete piers, and the approach spans rest on precast concrete pile bents. The 1901 bridge, made up of four 119-foot Pratt through truss spans and two pony truss spans, had been reported in seriously deteriorated condition by 1934. While the new bridge was being built immediately upstream, a pier of the old bridge subsided, forcing the crossing to close and requiring a detour road. Texas highway department engineers created a special design for the replacement bridge’s truss spans using a Warren truss configuration with parallel top and bottom chords. Oran Speer of Alvord served as contractor, and the Virginia Bridge Company of Roanoke, Virginia, fabricated the steel truss spans. Construction began on May 2, 1938, the bridge opened to traffic by January 11, 1939, and the project was officially completed on March 16, 1939, at a cost of about $138,000. In 1996, it was listed in the National Register of Historic Places at the state level of significance.
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