East of Eureka in the Kootenai National Forest, a nice 24 mile loop combines singletrack with closed forest roads. To reach the mountain biking trailhead from Eureka, follow US93 south for roughly 9 miles. Head northeast on FS114 for about 12 miles to junction with Blue Sky Trail (#74). Park here and continue riding up FS114 for 5 miles to the Whitefish Divide Trail (#26). Proceed south on the WDT for 12 miles past several high mountain lakes with vistas into Glacier National Park. Near Mount Looke, follow the Blue Sky Trail north 7.5 miles back down an old logging road to the car.
Overall, Whitefish Divide / Blue Sky Loop is the 12th most popular mountain bike trail of all 32 mountain biking rides in Montana.