Low Water Bridge at Ponca. If water is high enough to be running Boxley, there's a good chance the LWB will be covered. Make sure to get well to river left BEFORE you get to the bridge. On river left the bridge is more of a 'causeway' with no space to allow current to pass underneath it.
DO NOT UNDER ANY CIRCUMSTANCE GO RIGHT-MIDDLE as that's where the channel goes, and the bridge has a hole there to let the river thru at low water. It has been known to suck boaters underneath in this spot if they get too close. Don't be one of these boaters.