- State Highway 78 Bridge (Demolished) - Bonham TXSH 78 bridge at Red River is the only surviving K-Truss bridge in Texas. It has an overall length of 2,108 feet, and provides a crossing between Fannin County, Texas and Bryan County, Oklahoma. The "eight riveted K-truss through spans, with two camelback pony truss spans at each end" (Lauderdale, 1996) was a joint project between the Texas Highway Department and the Oklahoma Highway Commission. Primarily designed by OHC engineers, the K-Truss is "meant to afford greater span length and strength" (Jensen). Kansas City Bridge Company were the contractors, and there is a roadside park on each side of the...