It's surprising how much lava there was in this area and the way it's spaced out. This is from google maps of the bigger lava fields in the area. The Blackfoot ID part is on the right of photo next to I-15. There is a hike called TwentyMile that's not 20 miles off of Highway 20 so maybe that's why it's called Twenty Mile Lava hike https://www.alltrails.com/trail/us/idah ... lava-trail
a HAZer has hiked it: [ triplog ]