I've dived in the reservoir a few times. I come northern Colorado area and the lakes' viz is pretty much nil. Aurora has probably one of the best diving facilities around and on a good day I've seen 10-12' of viz. You can see from the front of the plane to the back. We also enjoy going out and catching crawfish and having a crawfish boil annually with our dive club (Banana Skin Divers) out of Greeley. We usually host that in August.