I was just at Pennyroyal this last weekend doing my Adv. Nitrox class. The vis in the shallows was fantastic! at about 40-50 ft, in the deep end it was very good good (40 ft+) until you reach the 90 ft mark or so & then it goes to about 6". The water temps. is starting to turn over & has everything stirred up at that point. It was miserable Sat. with it being rainy, cold & windy. Sun. was still cold but at least the sun was out making it look warmer. As for the deepest part of the quarry, it can be dove, but make sure you either have a DPV or plenty of gas, it's quite literally in about the hardest portion of he quarry to reach. The temperature from the surface was about 58 degrees with the bottom being the usual 45- 42 degrees. I told crpntr133 that I am planning on diving there the weekend of 29th- 30th. I can only make 1 day that weekend but it still should be fun. The winter hours for Pennyroyal is that you must call ahead & that there must be a minimum of 4 divers for them to open the quarry. The water table there is way down right now, so the deepest you may reach is only about 115 ft. I do know of a spot close to the shore where you can hit about 105 ft easily enough. The deepest I hit in the Adv. Nitrox class was 92 ft & probably could have gotten 95 ft, but that would have been pushing it.
I dive Pennyroyal pretty much year round, but it does slow down some in the colder weather. This winter I will be concentrating on my new cavern skills, as I want to go on to cave diving in Feb.