Just pay the site fee. No other fees or passes required. The annual National Park pass is not accepted...only the Senior Pass or Access Pass, formally known as the Golden Age or Golden Access Pass. The cardholder must occupy the site on which the card is used for and can only be used on one site.
The nightly fee is $20, but the nightly fee is half price if you have a Golden Pass or an America the Beautiful Pass.
Must have park pass or pay fee.
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