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Geology of Idaho. The Snake River Plain. Idaho can be divided into 6 natural geologic regions, each with its own unique characteristics. Clearwater Plateau. Northern Rockies. Snake River Plain. Middle Rockies. Owyhee- Bruneau Plateau. Basin & Range Province.

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Geology of idaho

Geology of Idaho

The Snake River Plain



Clearwater with its own unique characteristics

Plateau

Northern Rockies

Snake River Plain

Middle

Rockies

Owyhee-

Bruneau

Plateau

Basin & Range Province


The columbia plateau spills over into other states from washington even into 3 regions of idaho
The Columbia Plateau spills over into other states from Washington, even into 3 regions of Idaho


Columbia basalts show many layers from many sequential flows
Columbia Basalts show many layers from many sequential flows Washington, even into 3 regions of Idaho


These are the 3 regions of idaho that share a volcanic origin by extension of the columbia plateau
These are the 3 regions of Idaho that share a volcanic origin by extension of the Columbia Plateau

Clearwater Plateau

Snake River Plain

Owyhee-Bruneau Plateau





The Snake River is the main one, arising from Jackson Lake in Jackson Hole, WY, on the eastern slope of the Grand Teton range


It flows westward across the southern edge of the SRP. Over thousands of years it has eroded huge canyons in some places, like the Snake River Canyon near Twin Falls (below)



The deepest, most rugged part is called Hell’s Canyon, the deepest gorge in North America, 8000 feet below the surrounding mountain peaks



Lewiston l and clarkston r lie at the confluence of the snake back and the clearwater bottom rivers
Lewiston (L) and Clarkston (R) lie at the confluence of the Snake (back) and the Clearwater (bottom) Rivers


Lost river range
Lost River Range Snake (back) and the Clearwater (bottom) Rivers

  • Lost River Sinks


The Lost Rivers flow out of the valleys of the Lost River Range and disappear into the ground of the Plain


The waters become part of the Eastern Snake River Plain Aquifer flowing to the Snake River on the west





Srp formation
SRP Formation thousands of years

  • Volcanic activity

  • Water erosion

  • Sedimentation


Fissure flows
Fissure flows thousands of years



Numerous cinder cones buttes
Numerous cinder cones (buttes) thousands of years



Located in the east-central part of the plain in a triangular area formed by Arco, Idaho Falls and Pocatello



pahoehoe interpretive center

Cinder cones

Aa

Lava tubes



Water is down in the summer due to irrigation demands
Water is down in the summer created all this volcanismdue to irrigation demands



A series of dams to control flooding create recreation and provide irrigation water

A series of dams to control flooding, create recreation, and provide irrigation water

On June 6, 1976 the Teton Dam near Rexburg, Idaho failed during its initial filling.  At 350 feet high, it was the largest dam break in US history and the damages reached $1 billion.


After the breach
After the breach provide irrigation water


This water has increased the value of the mixed volcanic sediment soil to
This water has increased the value of the mixed volcanic-sediment soil to…….


Idaho agriculture
Idaho Agriculture volcanic-sediment soil to…….


Climate
Climate volcanic-sediment soil to…….

  • Mild and pleasant

  • Summers sunny and warm with few cloudy days; winters cool and dry

  • Precipitation averages 10 inches (25cm); semi-arid (quick thundershowers)

  • Summer temp.= 81degrees (105 max) with cool evenings

  • Winter temp.=13-35 degrees with snow in the mountains surrounding


From space volcanic-sediment soil to…….


End of the road! volcanic-sediment soil to…….


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