Information Line: (540) 999-3500. Backcountry Use: (540) 999-3500 ext. 3720 (Mondays and Thursdays only, messages will be replied to as early as possible) We receive a very high volume of calls. Please be sure to check our website before calling. The website is a great tool for planning, learning about hikes, and all you need to know about backcountry camping. The phone is staffed on weekdays only; calls are answered and returned 8:15 a.m. to 4:15 p.m. You may leave a brief message. Please include a phone number. During busy times, calls may take up to two days to be returned.