Oklahoma used a few standardized truss bridge designs rather heavily during the state highway system's prime expansion period. As a result, you can find a lot of these bridges all over the state highway system.

Bridge over the Washita River south of Lindsay on OK-76.

Bridge over the Washita River west of Wynnewood on US-77/OK-29.

And here's the James C. Nance deck truss bridge in Purcell. I should have thought to bring the OKC meet there; it wasn't too far away from the truss bridge we examined in Washington.