# Union Falls

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**Union Falls** is a fan-type [waterfall](/source/Waterfall) on Mountain Ash Creek, a tributary of the [Fall River](/source/Fall_River_(Wyoming,_Idaho)) in the [Cascade Corner](/source/Cascade_Corner) (southwest) of [Yellowstone National Park](/source/Yellowstone_National_Park), in [Wyoming](/source/Wyoming), United States. With a height of 250 feet (76 m), it is the second tallest major waterfall in Yellowstone, exceeded only by the lower [Yellowstone Falls](/source/Yellowstone_Falls). The falls was named by members of the [Arnold Hague](/source/Arnold_Hague) Geological Surveys sometime between 1884 and 1886. 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*.[2] Access to the falls is via the Mountain Ash Creek trail and the Grassy Lake Road.

## See also

- [List of waterfalls](/source/List_of_waterfalls)
- [List of waterfalls in Yellowstone National Park](/source/List_of_waterfalls_in_Yellowstone_National_Park)

## Notes

1. 1603858.

1. Whittlesey, Lee (1996). *Yellowstone Place Names*. Gardiner, MT: Wonderland Publishing Company. p. 174. ISBN 1-59971-716-6.

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