Does it have LTE data coverage for Sprint? If not LTE, is the cell service around there decent enough to watch YouTube videos?

You can get spotty LTE connections through Inland Cellular at the park. There may be 1 or 2 bars of cell service. There isn't any water there, but you can fill jugs at the Busch gas station in Potlatch. It's much cleaner than the nearby RV park.

It's Indland Cellular and very spotty

Barely have texting