if there's enough water to swim up, and the barometer takes a dive(like the afternoon before a big rainstorm) i've seen them bomb up river in the thousands.
this year, the rivers have been so low that i think many are stranded below log jams and shallow riffles and not even a few were making it up. supposed to be a phenomenal year for silvers out here, so i can't wait until the rivers flush out and drop into shape.