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As day and night airmail developed, the beacon system was expanded. The aforementioned beacon on top of Sherman Hill was built in 1925. At 8,600 feet above sea level, it was at the time reported to be the tallest airmail beacon in the world.
A photograph taken in the fall of that year (and later used on this airmail stamp in 1928) was snapped by Nebraska photographer Nathaniel Dewell. It showed the beacon tower along with the control hut and a giant concrete arrow in the ground.
The arrow used at these beacons were typically between 50 and 70 feet long and painted bright orange, making them clearly visible from today’s standard low altitude of the early airmail pilots. Most pilots of this era would fly at altitudes of 200-500 feet in order to navigate by these ground landmarks.
Readers may notice a slight variation in the photo used for the stamp. In the original photo there is a biplane; on the stamp, it is a single-wing aircraft. Why was plane changed? By 1928, biplanes were obsolete, so the photo was re-touched and the offending wing from the airplane removed.
By the mid-30s, radio and radar were just two technologies, that completely revolutionised how pilots would navigate, making beacons and ground arrows redundant. The beacon on Sherman Hill in Wyoming went dark for good in 1934. So, for a while, there was indeed a “lighthouse on the prairie”.
Today, a small green cinder-block structure as well as a smaller mast is in the same location where the beacon tower once stood. Portions of the 100-year-old concrete arrow in the ground is still visible. Looking east toward Cheyenne, one can still make out the contours in the mountains from Dewell’s 1925 photo.
Source: Brande, Even. "There Was Indeed a Lighthouse on the Prairie". Handel Information Technology Inc. Laramie, Wyoming. 2025.
