Don pretty much covered water clarity well.Early in the season the best color water to fish in is the greenish tinge.The fish prefer that over clear water because the dirty water is warmer than the clear water.You can even catch fish in brown colored water with cranks.As Don said, if you can still see your cavitation plate, you can still catch fish.But if so dirty that you can't see your cavitation plate, would be best to find cleaner water.You should keep an eye on the satellite pictures if cloudless enough to get a recent pic of Erie.I used to use the NOAA modis picture.But they changed their format recently and have poor quality pictures.Im going to use zoom earth going forward.As Don said,keep an eye out for edges of water clarity.The fish use these areas to ambush bait.Even a muddy river emptying into cleaner water has produced well for us at times.