United States · Wyoming
Union Falls
Union Falls is a fan-type waterfall on Mountain Ash Creek, a tributary of the Fall River in the Cascade Corner of Yellowstone National Park, in Wyoming, United States. With a height of 250 feet , it is the second tallest major waterfall in Yellowstone, exceeded only by the lower Yellowstone Falls.
Facts from Wikidata and Wikipedia, compiled September 2026; season and access are our estimate, not a visit report. How we build these pages.
Union Falls drops 76 metres (249 ft) on the Mountain Ash Creek, inside Yellowstone National Park. It is a fan-type fall, and the nearest base for a visit is Wyoming, United States. Access to the main viewpoint is rated moderate.
Summary adapted from the Wikipedia article (CC BY-SA 4.0).
As a fan waterfall, the flow widens noticeably as it descends while staying on the rock.
What you can do here
A walk-in-and-look waterfall
No commercial adventures run at Union Falls itself — the experience is the approach and the view. Guided day trips from Wyoming are the easiest way to combine it with the area around it.
Also good forHikingPhotographyWildlife & safari
When to go
Snowmelt-driven: April to June is the big-water window, and some falls almost disappear by late summer.
Getting there
- Base town Wyoming, United States
- Country United States
- Region Wyoming, United States, North America
- Access Moderate — a real walk — expect stairs, uneven ground or an hour on the trail
How it compares
This waterfall
Union Falls
United States
Height76 mWidth—
Most similar
Churchill Falls
Canada
Height75 mWidth—
Of similar height and in Canada
Largest curtain
Victoria Falls
Zimbabwe · Zambia
Height108 mWidth1,708 m
Largest single sheet of falling water
Tallest on earth
Angel Falls
Venezuela
Height979 mWidth—
Widest on earth
Khone Phapheng Falls
Laos
Height21 mWidth10,783 m
Measured across the whole multi-channel system
Angel Falls is 13× taller than Union Falls. Victoria Falls is 1.4× taller. We don't have a reliable crest width for Union Falls yet, so it is left off the width chart. Tallest · widest lists.
On the map
44.19241, -110.87065
Quick answers
Where is Union Falls?
Union Falls is in United States (Wyoming), inside Yellowstone National Park. The nearest base is Wyoming, United States. Its coordinates are 44.1924, -110.8706.
How tall is Union Falls?
Union Falls drops 76 metres (249 feet). It is a fan-type waterfall on the Mountain Ash Creek.
When is the best time to visit Union Falls?
Peak flow is April to June. Snowmelt-driven: April to June is the big-water window, and some falls almost disappear by late summer.
What can you do at Union Falls?
Beyond the viewpoints: hiking, photography and wildlife & safari. Access to the main viewpoint is rated moderate — a real walk — expect stairs, uneven ground or an hour on the trail.
How do you get to Union Falls?
The usual base is Wyoming, United States. A real walk — expect stairs, uneven ground or an hour on the trail from there.
Nearby
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