Geography
The Island Park area is an ancient volcanic caldera with scenic mountain ranges
replete with creeks & springs that drain into the Henry's Fork of the Snake River
Henry's Lake & the Island Park Reservoir. The landscape is dominated by lodgepole
pine and Douglas-fir forests, scattered stands of aspen trees, & open meadows.
Once you leave the agricultural Upper Snake River Valley outside of Ashton,
Idaho, you'll actually be driving up the edge of the caldera, a collapsed
volcano. Once you're on top, the landscape is relatively flat with rolling hills
and surrounded by mountains. The former caldera is 18 miles long, 23 miles
wide and is marked by a 1,200 foot scarp on the south and west rims.
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Information & Maps on many local hiking/biking/fishing trails in the Rocky Mountain States. Featuring ID, CO, MT, SD, UT and WY Trails.
Other pages you might find helpful:
Island Park Forest Service Office
US Department of Agriculture has a forest service office in Island Park, Idaho.





