Big Springs - Idaho - U.S. National Natural Landmarks on Waymarking.com

Long Description:
Big Springs is the only first-magnitude spring in the country that issues forth from rhyolitic lava flows and is the source of the South Fork of the Henrys Fork River.
Big Springs is located north of the 1.3 million-year-old Henry’s Fork Caldera at the western margin of rhyolite flows erupted from vents in the Yellowstone Plateau to the east. The water source is the rain and snow that falls on the Yellowstone Plateau and percolates down through the highly fractured rhyolite flow until it meets less permeable glacial and lake sediments where is spreads and moves laterally to emerge at the margin of the flows. Big Springs is the largest of many springs along the western edge of the Yellowstone Plateau.

Predominate Feature: Big Springs Parking/Access Location: N 44° 30.034 W 111° 15.350 Ownership: Federal Terrain Rating: Admission Charged: no Landmark's Website: [Web Link]

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Date Logged Log User Rating   9/25/2010 Volcanoguy visited it