From the looks of the cars and the bicycles and from what I remember, looks like the mid to late 50's to me. Don't know what happened to the building after that.
We're heading for the Bruneau Dunes. The grandson discovered a new sport...sandboarding. Like snowboarding but down the sanddunes on a smaller board.
I don't remember cardboarding down the dunes, just two-steps-up-one-step-back until getting to the top, watching the sand blow off the ridge, looking down at the Snake River, then running after lizards with no idea what I'd do if I cornered one!