As far as I know this bridge on Highway 222, west of Knox City, Texas, is the first one you encounter going downstream on the Brazos.

Built 1960. 800 Ft. long. Continuous deck. Steel I-beams. (Data from Bridges Over the Brazos by Jon McConal, TCU Press.)
Soon I will begin posting pics of bridges I have explored. Most will be Texas bridges. And most of those, at first, will be from the Brazos River. Unlike my original “We’ll See” photoblog, this will not be a daily blog. At first the updates will be frequent as I add pics I already have. As time goes by, the frequency will depend on my trips to see different bridges.