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Hell's Half Acre, Idaho Falls

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Hell's Half Acre Lava Field is a basaltic lava plain located on the Snake River Plain of Idaho in the United States. It is the easternmost of the basaltic lava fields on the Snake River Plain, located about west of Idaho Falls, Idaho and north of Pocatello, Idaho. In 1976, the National Park Service designated the northwestern portion of the site a National Natural Landmark. In 1986, the Bureau of Land Management recommended that of the site, located just southeast of the National Natural Landmark, to be a wilderness study area.Description of the siteThe Hell's Half Acre lava plain is located in Bingham and Bonneville counties in the state of Idaho. The site is about 150mi2 in size. The area where a former lava lake existed is marked by a 875yd long by 328yd wide depression near the summit of the lava field. Ten circular pits and two large lava tubes are also located near the summit. Two major lava flows, each about long by wide, extend from the main lava field to the south and southwest. These two lava flows surround "Morgans Pasture," a kipuka (or older geologic feature which was not covered by lava). More recently, scientists studying aerial photographs of the site discovered a 328yd long eruptive fissure partly buried under lava flows just from the northwest boundary of the lava field. This and other features of the site indicate that the fissure vent itself may be long.
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Hell's Half Acre Reviews
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TripAdvisor
  • This well-developed 3/4 mile trail through a lava field is a convenient and worthwhile stop if you are travelling south on Hwy. I15 through Idaho. The landscape is so unique and the interpretive signs...  more »
  • As of 10/29/2017 there are 2 rest stops at mile marker 101 on I-15 (one N-bound, one S-bound) and a completely different location off of highway 20 (about 20 miles west of I-15) which are referred to ...  more »
  • Great stop for a short hike on lava rocks. There was a porta potty in the parking lot but it was not very clean.  more »

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30 days in United States SEE PLAN January, popular PREFERENCES: January ATTRACTION STYLE: Popular PACE: Medium 3 days in Idaho Falls BY A USER FROM SPAIN September, culture, outdoors, historic sites, popular PREFERENCES: September, culture, outdoors, historic sites ATTRACTION STYLE: Popular PACE: Medium 60 days in Idaho BY A USER FROM UNITED STATES May, popular PREFERENCES: May ATTRACTION STYLE: Popular PACE: Medium 11 days in Idaho Falls BY A USER FROM UNITED STATES December, popular PREFERENCES: December ATTRACTION STYLE: Popular PACE: Medium 11 days in Idaho Falls BY A USER FROM UNITED STATES December, hidden gems PREFERENCES: December ATTRACTION STYLE: Hidden gems PACE: Medium 32 days in Idaho BY A USER FROM NETHERLANDS December, popular PREFERENCES: December ATTRACTION STYLE: Popular PACE: Medium 23 days in United States & Canada BY A USER FROM CANADA May, popular PREFERENCES: May ATTRACTION STYLE: Popular PACE: Medium 17 days in United States BY A USER FROM UNITED STATES July, teens, kids, fast-paced, popular PREFERENCES: July, teens, kids ATTRACTION STYLE: Popular PACE: Fast-paced 19 days in United States BY A USER FROM UNITED KINGDOM May, culture, beaches, historic sites, shopping, wildlife, slow & easy, popular PREFERENCES: May, culture, beaches, historic sites, shopping, wildlife ATTRACTION STYLE: Popular PACE: Slow & easy 2 days in Idaho Falls BY A USER FROM UNITED STATES January, popular PREFERENCES: January ATTRACTION STYLE: Popular PACE: Medium 8 days in Idaho Falls BY A USER FROM UNITED STATES April, popular PREFERENCES: April ATTRACTION STYLE: Popular PACE: Medium 58 days in Idaho BY A USER FROM UNITED STATES April, popular PREFERENCES: April ATTRACTION STYLE: Popular PACE: Medium
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