David, thanks for the report.
My family use to stop at the rest stop on I-15 (we called it "the Craters on the Moon rest stop) about 3 times a year when I was a kid (in the 60's). Doesn't look like much has changed. We use to go exploring out 1/4 mile from the rest stop, rock hopping in the unforgiving terrain. Its nice to see the other faces of the area.
Definitely a different place-
BTW, interesting that you found horse shoes; my father in law and his brothers (now passed away) drove horses through that area in the 20's. They would round the wild horses up around where Sun Valley is now and drive them to Star Valley, Wyoming.
Those could have been from some of their Saddle horses.