Grand Canyon will begin interim permit process for some rim-to-rim runners and hikers while master plan is completed

The Grand Canyon has become so popular with ultra runners doing rim-to-rim and rim-to-rim-to-rim runs, and long-distance hikers, that the National Park Service will institute an interim regulation process in September for the first time. The process will coincide with public comment on a new backcountry management plan. My story for ESPN.com Endurance Sports: http://espn.go.com/sports/endurance/