Union Falls , WY, USA


Address -: Union Falls , Mountain Ash Creek ,Cascade Corner of Yellowstone National Park , WY, USA

Union Falls ht. 250 feet (76 m) is a waterfall on Mountain Ash Creek, a tributary of the Fall River in the Cascade Corner (southwest) of Yellowstone National Park. It is the second highest waterfall in Yellowstone exceeded in height only by the lower Yellowstone Falls. The falls got its name from members of the Arnold Hague Geological Surveys sometime between 1884-86. Geologist J.P. Iddings claims the name derives from the fact that a tributary of Mountain Ash Creek joins at the very brink of the falls, thus Union Falls. Access to the falls is via the Mountain Ash Creek trail and the Grassy Lake Road.


The trail begins just south of the park at the base of the Grassy Lake Reservoir dam, on the Flagg Ranch to Ashton, Idaho NFS road, 10 miles west of Flagg Ranch. The gravel road is sometimes closed early in the summer due to spring washouts. Check with the Targhee National Forest or at Flagg Ranch before heading out. Also, the road to the base of the dam may be too steep and rough for some cars. To avoid getting stuck, you may wish to park your car near the top of the dam and work your way down to the trailhead on foot. The Falls River ford should not be tried before mid-July. Even then it's a tricky, swift, cold, 40-foot, knee-deep ford. Although this 16.6 mile trail can be done in a very long day, reserve a backcountry campsite and take time to enjoy one of the best routes in Yellowstone.


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