American Falls, Idaho: Devil's Gate

Volcanic tuff knobs remain from an extinct volcano in a place early emigrants called Devil's Gate Pass, and the Gate of Death. The park features a disc golf course.

Massacre Rocks State Park

Address:
3592 Park Ln, American Falls, ID
Directions:
SW of American Falls, I-86 Exit 28 west on Register Rd, turn right/north 1/2 mile to Massacre Rocks State Park.
Phone:
208-548-2672
Admission:
$5 vehicle day use fee.
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Devil's Gate

Resistant knobs of volcanic tuff, most no more than a foot high, that are erosionally resistant remnants of small gas vents in the tuff flow. Gas (with silica-rich water vapor) flowed through the vents. As the water vapor cooled the silica came out of solution, cementing the material surrounding the vent.

[Brad Wartman, 10/29/2011]

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April 19, 2014

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