Columbia Falls Air Force Station is a closed

United States Air Force The United States Air Force (USAF) is the Aerial warfare, air military branch, service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part ...

radar station in Washington County,

Maine Maine () is a state in the New England and Northeastern regions of the United States. It borders New Hampshire to the west, the Gulf of Maine to the southeast, and the Canadian provinces of New Brunswick and Quebec to the northeast and ...

. Located northwest of

Machias, Maine Machias is a town in and the county seat of Washington County in Down East Maine, United States. As of the 2020 census, the town population was 2,060. It is home to the University of Maine at Machias and Machias Valley Airport, a small publi ...

and north of Columbia Falls, it went operational in 1990 but was closed in 1997 and placed in "warm storage" with minimal maintenance. It was deactivated and placed in "cold storage" in 2002.

History

Development of Columbia Falls AFS can be traced to work undertaken by USAF

Rome Air Development Center Rome Laboratory (Rome Air Development Center until 1991) is the US "Air Force 'superlab' for command, control, and communications" research and development and is responsible for planning and executing the USAF science and technology program. ...

ADC ADC may refer to: Science and medicine * ADC (gene), a human gene * AIDS dementia complex, neurological disorder associated with HIV and AIDS * Allyl diglycol carbonate or CR-39, a polymer * Antibody-drug conjugate, a type of anticancer treatm ...

engineers in the early 1970s who were developing an over the horizon backscatter radar (OTH-B) system. The system was based on a frequency modulation/continuous wave (FM/CW) radar capable of detecting and tracking objects at over-the-horizon ranges. In concept it involved bouncing radar signals off the ionosphere which allows radar to overcome the

curvature of the Earth Spherical Earth or Earth's curvature refers to the approximation of figure of the Earth as a sphere. The earliest documented mention of the concept dates from around the 5th century BC, when it appears in the writings of Greek philosophers. ...

. The first, most northernmost 60 degree sector of coverage was built as the OTH-B Experimental Radar System (ERS). At that time the operations were conducted at the receive site at Columbia Falls AFS. The system was bi-static, with the transmitter being located at Moscow Air Force Station. System and Initial Operational testing was conducted from June 1980 to June 1981. Successful testing resulted in the decision to develop operational OTH-B systems for the east and west coasts and in Alaska. The east coast OTH-B system was designed and built by

GE Aerospace GE Aviation, a subsidiary of General Electric, is headquartered in Evendale, Ohio, outside Cincinnati. GE Aviation is among the top aircraft engine suppliers, and offers engines for the majority of commercial aircraft. GE Aviation is part of th ...

and consisted of an AN/FPS-118 radar with the transmitter located at Moscow AFS and the receiver at the newly constructed Columbia Falls AFS. The transmitter and receiver stations were manned by personnel of the 776th Radar Squadron. Data processing took place at

Maine Air National Guard The Maine Air National Guard (ME ANG) is the aerial militia of the State of Maine, United States of America. It is, along with the Maine Army National Guard, an element of the Maine National Guard. As state militia units, the units in the Maine ...

Bangor Air National Guard Base Bangor Air National Guard Base is a United States Air National Guard base. Created in 1927 as the commercial Godfrey Field, the airfield was taken over by the U.S. Army just before World War II and renamed Godfrey Army Airfield and later Dow Arm ...

which was close to the geographic halfway point between the TX/RX facilities. The east coast OTH-B system was tested in the late 1980s and went operational when it was handed over to USAF in 1990. It was the largest of the three OTH-B systems and was so powerful that it could even detect changes in

ocean currents An ocean current is a continuous, directed movement of sea water generated by a number of forces acting upon the water, including wind, the Coriolis effect, breaking waves, cabbeling, and temperature and salinity differences. Depth contour ...

. Transmissions from the Moscow AFS site covered an arc from 16.5° to 76.5° and from to in range. The fall of the

Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, ...

and end of the Cold War saw the OTH-B systems rendered obsolete for detecting intruding military aircraft, however, the east coast OTH-B continued operations until 1997 and its data saw use by the United States Border Patrol for tracking aircraft used by drug smugglers, as well as the

National Oceanic and Atmospheric Administration The National Oceanic and Atmospheric Administration (abbreviated as NOAA ) is an United States scientific and regulatory agency within the United States Department of Commerce that forecasts weather, monitors oceanic and atmospheric conditio ...

which made use of the measurements of ocean currents and weather patterns. The facility was placed in "warm storage" in 1997 and in 2002 it was deactivated and placed in "cold storage" with equipment removed from the site.

References

External links

Information for Columbia Falls, ME
* *Additional HAER documentation, all filed under Over-the-Horizon Backscatter Radar Network, Columbia Falls Radar Site, at the end of Shadagee Ridge Road, Columbia Falls, Washington County, ME: ** ** ** ** ** ** ** ** ** ** ** {{Navboxes , list = {{Washington County, Maine {{FmrMEMilitary Historic American Engineering Record in Maine Installations of the United States Air Force in Maine Radar stations of the United States Air Force Buildings and structures in Washington County, Maine 1997 disestablishments in Maine 1970s establishments in Maine Military installations established in the 1970s Military installations closed in 1997