I think it's quarters. No change machine that I saw, but you can get change from the rangers at the desk.
Yes there's a change machine it takes quarters 1.75 for washer 1.50 for drying
There's a laundry mat in town we use. It takes both cards and quarters, and they have multiple change machines.
They take quarters and no there is no change machine but you can get quarters at the welcome center.
Sorry. Did not use the laundry when we were there. Most take quarters in our travels of TT RV. Parks
Thanks! Your answer is awaiting moderation.