I've dove Lake Ouachita for a few summers straight now. I dove the dam in '04 and went down to about 80 feet. Then I came back up and followed the rope going off of the rocks on the dam and found a mailbox (with a fish in it), a golf cart with clubs, and some sunken boats. The first time I dove it the viz down deeper was probably about 30 plus feet. It looks real deep and dark below the sunken vehicles. Not much fish life here, but a great freshwater dive. The steps leading down to the dam are nice. Lost a nice mask (clear) and snorkel here. I also like diving across from Mountain Harbor, I believe around island 18. Some nice coves and points there, and with a bass boat you can look for good viz. When I hit 22-25 feet, the water does get cold. Take a 7 mil suit if you plan to dive deep, otherwise a 3 mil would do the job. It gets dark real fast here, so I mostly dove the islands to 25 feet max. Lots of fish life around these islands. I do agree that you need a boat to dive Ouachita. I'd be interested in other spots to dive in this lake.