There were actually *three* bridge choices...one was obscured by marshy vegetation as you stood at the start but I looked closely at my map and once I saw I needed to cross the stream, I found it and the one beyond the Go control on the map, and took the middle one. It saved a few steps. ;-)
You're right, of course, and I didn't see those bridges. In fact, I didn't see the one I crossed on the map. I just saw a way to get to the other side and took it. I was happy to pass some other Brown runners down the road and get some confirmation that I was going the right direction.