Yes you do need to make a reservation. To stay it is usually anywhere from 10-30 dollars depending on how many people you're going with and how big of a campground it is. It is definitely worth the price because it is a lovely place.
There are specific camp ground for reservations. Others are first come first serve but they are much better spots..
You definitely need to reserve ahead of time. Prices can be found on the Great Basin website, as there are different types of camping lots.
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