Monee Gap Filler Annex - Monee, IL
Posted by: Groundspeak Premium Member cldisme
N 41° 24.730 W 087° 45.997
16T E 435929 N 4584796
In operation from 1962 to 1968, this radar site now serves for a cell tower.
Waymark Code: WMBNX7
Location: Illinois, United States
Date Posted: 06/07/2011
Published By:Groundspeak Premium Member kJfishman
Views: 9

This waymark is on private property and is not available to the general public. Please visit this waymark at the posted coordinates at the intersection of Ridgeland and Bruns Roads.

According to a 2004 Army Corps of Engineers Report (PDF/2.5Mb):

the property was used by the U.S. Air Force to establish a station to fill a gap in radar coverage in the area of Monee, Illinois. The property was designed to be an unmanned radar facility under the control of the 755th Radar Squadron out of Arlington Heights, Illinois, (RP-31) from circa 1959/1960 through 1968. However, military records indicate that the facility may have been controlled by the Williams Bay Air Force Station, Wisconsin, (P-31) briefly before Arlington Heights took control of the property. Additionally, as of 1 May 1968, reference is made to the Chanute Air Force Base in Illinois being the primary installation over the Annex.

In March 1962, the Monee Gap Filler Annex became fully SAGE (Semi-Automatic Ground Environment) integrated. SAGE is a computer system used by the U.S. Norad Air Defense System. Effective 14 August 1968, the Monee Gap Filler Annex was declared excess by the Air Force.


The radar has been dismantled but the original building remains. A cell tower now dominates the skyline instead of the radar.
Squadron number: 755

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