Upper Mesa Falls
|Upper Mesa Falls|
Upper Mesa Falls in June, 2008
|Location||Fremont County, Idaho|
|Elevation||5,600 feet (1,707 m)|
|Total height||114 feet (35 m)|
|Watercourse||Henrys Fork (Snake River)|
Upper Mesa Falls is roughly 114 feet (35 m) high and 200 feet (61 m) wide.
Mesa Falls Tuff, which is the rock over which Upper Mesa Falls cascades, was formed 1.3 million years ago. A cycle of rhyolitic volcanism from the Henrys Fork caldera deposited a thick layer of rock and ash across the area. This layer compressed and hardened over time.
Between 200,000 and 600,000 years ago, the river eroded a wide canyon which was subsequently partly filled with basalt lava flows. The Henrys Fork of the Snake River then carved the channel through the basalt; which is the inner canyon seen today.
|Wikimedia Commons has media related to Upper Mesa Falls.|
- "Upper Mesa Falls, Idaho". Public Lands Information Center. 2008. Retrieved 2008-08-13.
- "Upper Mesa Falls". Geographic Names Information System. United States Geological Survey. Retrieved January 15, 2015.
- "Mesa Falls Near Ashton Idaho".
- Shallat, Todd A; Bentley, E B (1994). Snake: the plain and its people. Boise, ID: Boise State University. p. 53. ISBN 978-0-932129-12-3. OCLC 31689273.
- Mesa Falls Visitor Center (USDA Forest Service - Caribou-Targhee National Forest)
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