if the drop off is close enough to the pier/dock, try that. The depth will vary daily, you'll have to play the "seek and ye shall find" game with 'em. If casting, then let the lure drop down to different depths until you find 'em, when you get a hit, then try and do it again at that depth via the count down method to reach a depth. If you're use floats, then you'll have to adjust the depth of the lure that way.
GO BIG ORANGE !
I meant to behave, but there were just way too many other options available at the time.