NR is right. The spaces are decent size but the roads are tight. There are some spaces close to the entrance that might work. I hope you can get in. It's a beautiful place.
Man I would not attempt it with anything over 24'...and dont even try to back your trailer after sunset, it gets seriously dark fast.
Paul we had some people stay next to us that had bigger than 30ft. If you can pull up there sight map it was the space directly next to #7 . You can also call the Ranger station there the phone number is on there also , Good luck and happy camping it a bueatiful place!!!
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