Long Lake

I don't think beaches are pervasive features on lakes in the Adirondacks, but they are found locally. In most cases, the forest comes right down to the water's edge and I guess there's not enough sediment, and not the appropriate wave environment, to maintain beaches. But the presence of coarse-grained igneous rocks (anorthosites) that erode to form sand-size material and a glacial legacy of scour and redeposition suggests to me that enough sediment might be available in some places, if the wind and wave conditions are sufficient. On the other hand, a cursory look at Google's imagery suggests that many of the small beaches may have benefited from a human hand (and some dump truck loads of sand). 

I spent a night in late August near this one on Long Lake. Which was long enough to appreciate the beautiful evening and subsequent morning, but not enough to actually learn much about the beach or even the local geology.

I did learn that the one thing that all beaches in the Adirondacks have in common are the chairs.