I bought a Cabin Cruiser in April 2016, that needed a little(okay a lot of)work. I've had it on our local lake(McPhee) several times this summer, but haven't taken it to Powell yet. I'm planning to make the Powell maiden voyage next weekend(21&22). The plan is to launch at Halls Crossing and motor up to GHB, or White Canyon. My question is regarding pumping out my black water tank. I know there are pumpouts at Halls, but what does it cost? Or would it be better to use the hand pumps at the floating bathroom in GHB? Are there any fittings that I should have on board for either situation(I've never pumped the tank before and could use some advice). It's only a 20 gallon tank, so I wouldn't think it would be a time consuming process?