Historic Posts, Camps, Stations and Airfields
Yreka Filler Annex TM-180A
Typical AN/FPS-14 Gap Filler Radar
"During the late 1950s another area of progress was the development and deployment of AN/FPS-14 and AN/FPS-18 gap-filler radars. Having a range of around sixty-five miles, these radars were placed in areas where it was thought enemy aircraft could fly low to avoid detection by the longer-range radars of the permanent and mobile radar networks. Gap-filler radar deployment peaked in December 1960 at 131 sites throughout the continental United States. Because the introduction of gap-filler radars alleviated the need for civilians to scan the skies for enemy bombers, the ADC disestablished the Ground Observer Corps on January 31, 1959."
Searching The Skies
USAF Air Combat Command
June, 1997
Typical floorplan of a Gap Filler Annex

After the U.S. Forest Service issued a special use permit on 2 June 1958 to the U.S. Air Force, the Yreka GFA was built on Gunsight Peak. The former Yreka GFA was used to relay radar data from blind spots back to Keno Air Force Station in Oregon. The former Yreka GFA was an unmanned post with a 70 foot steel antenna, a generator and equipment building, and a 5,000-gallon UST. By 1961, technological advances had eliminated the need for gap filler facilities, and the former Yreka GFA was recommended for disposal.

Source: Sacramento District, US Army Corps of Engineers


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Updated 8 February 2016