it will usually hold til september or so depending on how warm it stays or if you get a good rain to cause the water to raise.other than spawning there will always be deeper big fish.last fall in october when i was crappie fishin ledges and had a good bag of bass that were in the 14lb range while guys in a tourn.were beating the flats and it only took 6lb and change to win.they should have been shallow but weren't so always keep an open mind and if the shallows aren't getting it go deeper.