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From the late 1920's to about 1973, there was a nationwide system of lighted airways with rotating beacons every ten miles or so along designated routes. I understand the state of Montana still maintains and operates a few beacons in the mountainous western half of the state.
When I was growing up we used to see the airway beacon flashing atop Kitattiny Mountain near Belvidere, NJ, on clear nights. The NY-SF lighted airway system was still operational in the late 1960's, even though by then radio navigation had long since come to the fore. It fired my youthful imagination to think of the airmail pilots and early airline pilots finding their way across the country, in the dark, guided by these flashing guideposts.
In the early 1980's I had a commercial glider operation at Granby, CO, during the summers. In a corner of an old hangar there I came across the decommissioned airway beacon that had been installed on top of Corona Pass as part of the LA-Denver airway. I wish I'd had the foresight to buy it, but I was a young whippersnapper, with no thought to the historical aspect of the thing.
These days, about the only evidence you can still see of the old airway beacon system is the concrete pads, shaped like giant arrows, that the beacon towers and generator shacks were built on. If this link works you can zoom in on the satellite view showing three of the beacon sites, with their arrow-shaped concrete pads still visible. These are around St George, UT, on the Las Vegas-Milford segment of the LA-Denver airway.
Airway beacon sites near St George
The good folks of Cibola County, NM, have restored an airway beacon and generator shack relocated to the grounds of the Grants-Milan Airport. They're also restoring an old Flight Service Station (remember those, with their wet-process facsimile machines and clacking Teletypes?), ca. 1953. I'll have to go pay them a visit.
Here endeth the aviation history lesson for today...