We stopped at the Prowers Bridge, a series of truss spans over the Arkansas River in eastern Bent County.
The bridge was constructed around 1902. It has three camelback trusses, two Pratt through-trusses, and one Pratt pony truss.
This reference, Bridge Basics,describes those trusses in detail.
The bridge has been closed to traffic for years. There is a new bridge a few yards to the west of it. Take either CR 34 or CR 35 south from US 50 to CR JJ, then either right or left, depending on which road you took from US 50, to CR 34.5. You can see the bridge from either intersection with JJ.
Here are some photos, taken during our road trip of July 11: