This 100-mile point-to-point course from Logan, Utah to Fish Haven, Idaho stands as one of the most prestigious qualifiers in ultrarunning, earning spots for Western States 100, Hardrock 100, and serving as a UTMB World Series event. The race follows the legend of Old Ephraim, a grizzly bear that roamed these mountains, with winners receiving the coveted Old Ephraim award.

The course delivers relentless challenge with 22,816 feet of elevation gain, peaking at 9,043 feet through the Wasatch-Cache National Forest. Starting at Mount Logan Park, the initial climb presents the steepest challenge before runners navigate 70% single-track trails, 29% dirt roads, and minimal pavement. The late September timing showcases spectacular fall colors—brilliant red maples and golden aspens—but demands preparation for unpredictable mountain weather ranging from pleasant days to potentially snowy nights.

Twelve well-stocked aid stations provide hydration, Spring Energy gels, and substantial food options from sandwiches to hot soups, though the race maintains a cupless policy. The 36-hour cutoff allows for a challenging but achievable timeline for prepared runners.

Entry requires completing a 50-miler under 16 hours or any longer ultra under cutoff, plus eight hours of trail work or race volunteering. The race committee strongly recommends running significant portions of the course beforehand, as navigation becomes critical in braid-heavy cattle trail sections and during night running near the finish.

Finishers receive an engraved plaque and belt buckle, while top three in each gender earn cash prizes up to $500, with $1,000 for course record breakers.