I overnighted here on a kayak camping trip. It's a nice campsite - level ground, spacious, a good fire pit and plenty of burnable wood. Would be 5 starts if the water pump worked (it did not). For anyone wondering how accessible this campsite is from the water - it's very doable! Definitely need GPS to find the campsite from the water as there are no obvious markers, but once you find the path it's straightforward to get out of the water and up to the campsite. One note about the water in the Potomac, we were there in late September and the water level was very low (1.1 feet at Point of Rocks, MD) - that said, it was easily passable for our journey from Noland's Ferry, MD to Edward's Ferry, MD. Water was for the most part very calm, only a few spots of Class I (maybe Class II - but that's a stretch) rapids. Marble Quarry made for a great stop overnight!