Anything over 30ish will put you outside the scuba area at aurora but we did get to 60ish for AOW this June, just outside of the buoysYeah I dove the gravel ponds in June then Aurora a few weeks after and the vis was terrible at both. I do like Chatfield as its easier to get your gear in the water, but with a max depth of 18' a bit limited. I need to explore Aurora a bit more so I know where it gets deeper and play around in the Nav course.