There are always pole fishermen on the bridge, many of which will gladly take your buffs. Park where they do, at the ends of the bridge on the shoulder.
It's a little tight on the North side, so pull in your mirror if you can. Stay away from the gated entrances to the lock buildings.

If you end up deciding to go it alone, we can talk on the phone about how too keep out of trouble wading that area alone.