from Mono County Tourism
The Reds Meadow/Devils Postpile Shuttle will begin operating on June 17. You can purchase tickets via Mammoth Mountain in person or at https://www.mammothmountain.com/summer-activities/adventure-center/devils-postpile
Please make sure to bring your Mountain Manners and keep the Leave No Trace principles in mind during your visit.
Seven Principles of Leave No Trace:
Plan ahead and prepare Travel and camp on durable surfaces Dispose of waste properly Leave what you find Minimize campfire impacts Respect wildlife Be considerate of others
naturalhistorywanderings.com 
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