This is another lake Waco road that seems to be a blown out drainage ditch. I don't think this was a highway but a city road. I don't think it was a bridge because i did not see chunks of an old bridge. But who knows could have been a wooden bridge there. This is from the early 60s.
http://i641.photobucket.com/albums/uu135/Bobcat316/Rd2.png