that bridge has everything a crappie needs, depth or not, baitfish, cover at several depths and lots of folks with no clue on most occasions. I cant count the times Ive been there and heard folks say something like, "no current so no bite" or "I never catch them deeper than 6 ft" etc..... . there are catchable crappie there year round for those in boats, and most days from the bank. I caught several good slabs there back in July from the bank that were only 8 ft deep and that's not uncommon. try changing tactics to get a bite.