The Southern RV loop below the dam is pretty tight and has a windy paved entry. It may have electric. The Western RV loop is very clean, moderately tight spacing and has only water, trash, and I'm told... cold showers!
There was only 1 bar of Verizon on Android and iPhone. Its at least a mile to the highway noise, so very quiet. $20 for a night with water, trash and dump station.