Lava Trail ♦ Hell's Half Acre
Brochure | Map | Wilderness Study Area information
The Hell's Half Acre Lava Trail crosses the Snake River Plain desert through the rough terrain and contorted landscapes created by multiple lava flows. The Hell's Half Acre flow is the most recent in eastern Idaho, having erupted about 4,100 years ago. The flowing lava in these eruptions was probably about 2,000°F, the consistency of molasses, and traveled at speeds up to 30 mph.
Hell’s Half Acre is a National Natural Landmark (NNL) and a wilderness study area (WSA), designations which help preserve the area for enjoyment and study. The Lava Trail system is open to non-motorized recreation activities only.
Geology
Lava rock is extremely sharp, glassy and fragmented, with open cracks, lava tubes and caves. A'a (ah-ah) and pahoehoe (pa-hoy-hoy) lava flows are the most prevalent here. Areas of soil and vegetation not covered by lava are called kipuka, a Hawaiian word meaning 'window in the lava.'
Botany
In spring and early summer, wildflowers color the landscape and contrast with the black and gray lava rock. Ferns grow in deeper cracks. Tiny mosses and lichens and juniper trees hundreds of years old mix with native grasses.
Wildlife
Mule deer, antelope, sage grouse, bobcats, coyotes, foxes and occasional snakes inhabit the lava flows and kipukas. Soaring above are red-tailed hawks, prairie falcons and golden eagles.
Explore the Lava Landscape
| Trail Description | Directions |
Hell's Half Acre Trail | Interpretive signs discuss geology and biology |
About 20 miles southwest of Idaho Falls and 5 miles east of Blackfoot. From I-15, take the "Blackfoot Rest Area" exit. Access the trails from the parking areas.
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20-Mile
Trail | A ½-mile loop or a 4½-mile trail to the main vent of the flow. Both are unimproved and marked with poles.
An easy–moderate hike |
From Idaho Falls, travel west on Highway 20 to mile marker 287. Continue 0.3 miles until you see a sign for "Lava Trail." Turn south onto the gravel road and continue one-quarter mile to the trailhead.
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