Air mail in Idaho

I used to do a lot of road trips. Back then, in the days when folks could pay extra to send a letter by Air Mail, quite a few families put Air Mail boxes sky-high as a joke. Here's one east of Filer, Idaho. I didn't get an exact address, but it's on US Highway 30 near the junction with US 93.

I was cruising by on May 14, 1976.