I certified (the 2nd time) in Lake Quachita - but somehow haven't made it back to dive
I know that Rick's Dive shop out of Little Rock runs a pontoon dive boat there on weekends in the summer - $30 per diver - but haven't been with them.
http://www.ricksdivecenter.com/center/center_index.html
Air Fills are available at one of the marinas on the lake through Ocean Extreme - another Little Rock Dive shop - I'd call & verify though as I once heard the fill station was temporarily shut down.
(
Lake Ouachita.)
Air fills are also available at the Scuba & Archery Center in Hot Springs. I've gotten fills there before because I travel to Hot Springs frequently for work related stuff. I don't know what/if their weekend hours might be. They are about 1/3 dive shop & 2/3 archery shop.
Lake DeGray is a little closer to Texas than Quachita & just as clean & good vis. I dove near the dam once with some folks associated with the part-time dive shop out of El Dorado, Arkansas (I forget the name)
There's a lot of hotels & stuff to do in Hot Springs if you want to make a longer trip of it &/or have non-divers with you. Also a dog track if you are into that. There's a fairly large bike-rally there each year also. Or there are quite a few accommodatons closer to the lake for Lake Quachita.
For Lake Degray you can camp, stay at the State Park Lodge - nice place -
Arkansas lodging at Lake DeGray Lodge, a lakeside resort & there are a few other local accommodations you can google up - or you may want to stay in Hot Springs. For $ & convenience the closest name-brand motels to Lake Degary are at the Caddo Gap exit on I-30 just past Arkadelphia. These are only 10 or 15 minutes from the lake & pretty convenient.
Coming from Texas you'll want to take I-30 to the Caddo Gap exit just past Arkadelphia, AR & take Hwy 7 which crosses over Lake DeGray & goes into Hot Springs
Both are supposed to be among the cleanest lakes in the country - and both reportedly get pretty cold below the thermocline. Both are quite deep (over 220') I've fished them both & seen it on my depthfinder. (Oh, - & you can spearfish on both lakes - check State of Arkansas for regulations)
I know at least one of the Dallas dive clubs has had events at Quachita (Scubadillos?)
I'd like to head up to DeGray some weekend this summer, but have no plans yet - I have a boat, so if anybody's going - or wanting to go - drop me a line & maybe we can cook something up. (I'm in Texarkana BTW)