Hi Crappster. Sorry to hear you didn't have much luck. Sounds pretty much like my last couple trips up to Blackshear.
I have fished the 280 bridge a few times. Had good luck there once or twice and poor luck there once or twice. Last couple trips up that way someone was sitting in the spot I like to fish so I couldn't get over there. But, if you do make the trip across to the bridge, look for the Sonny Perdue sticker on the trussel side of the bridge. It's on one of the concrete pilings about middle of the bridge. I, and a few of my friends, have had decent luck right there.
The last couple times that I've been there, there were some decent numbers, and sizes, coming from the channel before you get to the trussel. We were fishing the drop-offs from 18-20 feet down to 26-32 feet right on the edge of the channel. You might have a little luck over there.
Good luck.