Powell AFS (and two good resources), page 1

According to the Pentagon, the Powell AFS is long range radar station. It could be an expermental version of a prototype early warning radar system to detect incoming nukes. Now the Air Force uses a more sofisticated radar at Clear AFB, Alaska. During the Cold War years, they used big golf ball size radomes. There is massive one in Cold Bay, Alaska on the Aleutian chain. I use to work out there in the early 1990-1992 and it was manned by one person that basically took readings. Once of month, a spook plane would fly in with a courier to pick up a briefcase.

The newer radar system which is an element of the missile warning and space surveillance system is the Ballistic Missile Early Warning System (BMEWS). The primary mission of BMEWS is to provide NORAD with Tactical Warning/Attack Assessment (TW/AA) data on all ICBMs and SLBMs penetrating the site's coverage. The secondary mission is to provide NORAD with Launch and Impact (L&I) predictions for attack assessment by NORAD.

Ballistic Missile Early Warning System - BMEWS - The BMEWS sensors consist of an AN/FPS- 120 two-faced phased array radars located at Thule AB, Greenland. Three AN/FPS-50V detection radars, an AN/FPS-92 tracking radar at Clear AFS, AK, and an AN/FPS- 126 three faced phased array radar at Royal Air Force (RAF) Fylingdales, United Kingdom.

Thule Air Base is located 700 miles north of the Arctic Circle. The unit there manages and operates the AN/FPS-120 model solid state phased array radar or SSPAR for short. The radar became operational June 24, 1987, replacing the old system, which was in use for more than a quarter of a century-

Thule (Site 1) was the first UHF phased array radar designed for BMEWS ICBM warning. This dual-faced phased array radar contains 3169 antenna elements per face of which 2560 per face transmit and receive RF energy. Each array provides 870 kW of RF power. The arrays receive target returns, which are processed by the signal processors and sent to the prime mission computers for final processing and transmission to forward users.

The unit is responsible for providing tactical warning and attack assessment of a ballistic missile attack against the continental United States and southern Canada. Located at the most northern US base, it would also provide attack assessment and detection in the event of a sea launched ballistic missile attack.

Warning data from the unit is forwarded to the North American Aerospace Defense Command, Cheyenne Mountain Air Force Base, Colorado. The squadron is also responsible for a portion of the Air Force Space Command Space Surveillance Program and assists in tracking more than 7,000 Space objects currently in Earth's orbit. The SSPARS radar beams can reach out for approximately 3,000 nautical miles in a 240° sweep, and at this extreme range can detect an object in space the size of a small automobile. The radar is capable of detecting smaller objects at closer range.

Clear Air Force Station, Alaska (BMEWS Site II) is 40 miles north of Mount McKinley and 80 miles south of Fairbanks. It manages and operates three AN/FPS-50 detection radars (DR) that cover 120 degrees in azimuth and approximately 3000 nautical miles in range. It also supports a AN/FPS-92 tracking radar (TR).

Each AN/FPS-50 detection radar consists of three antennas and associated equipment, which monitors three areas; each area is 40° in azimuth. The DR antennas are 165 feet high by 400 feet long. They continuously watch a fixed area of space for missile launches and orbiting satellites. Radar beams at two elevation angles repetitively scan each of the DR areas. The upper radar fans radiate at 7.0° elevation and the lower radar at 3.5° elevation.

The AN/FPS-92 tracking radar is a mechanical antenna 84 feet in diameter, housed in a 140 foot high radome. Radar signals are sent out and processed for targets. This radar also performs space surveillance functions.

The unit is responsible for providing tactical warning and attack assessment of a ballistic missile attack against the continental United States and southern Canada. Warning data from the unit is forwarded to the North American Aerospace Defense Command inside Cheyenne Mountain Air Force Base, Co. The squadron is also responsible for a portion of the Air Force Space Command Space Surveillance Program and assists in tracking more than 7,000 Space objects currently in Earth's orbit. Prime power at Clear Air Force station is obtained from the station's coal fired power plant, which is capable of producing 22.5 megawatts of power.

Clear AFS's detection radars (DRs) consist of transmitters, reflectors, receivers, and the Detection Radar Data Take Of f (DRDTO). The transmitters supply two 4 megawatt beams (upper and lower) of RF energy to each of the DR reflectors. The reflectors are positioned to reflect the lower beams at 3.5 degrees elevation and the upper beams at 7.0 degrees elevation. The reflectors receive target returns, which are routed to the receiver channel for amplification. The signals are then routed to the DRDTO, which performs analog to digital conversion. The signals are next processed by the mission computers and sent to forward users. The Clear AN/FPS-92 tracking radar utilizes multiple transmitters to supply 8 megawatts of RF energy to an 84 foot diameter parabolic dish antenna. Target returns are processed in much the same way as those of the detection radar.

The Fylingdales phased array radar (Site III) became operational in 1992. With the exception of the additional array face, it has many of the same features of the Thule system.

Lovell, aka Powell AFS was an Air Route Surveillance Radar (ARSR) facility housing a ARSR-2 Joint-use FAA/USAF radar that fed information to the Air Defense Command radar network. It was manned by the 1 Combat Evalution Group, Detactment 16.

The ARSR is a long range surveillance radar, primarily operated and maintained by the Federal Aviation Administration (FAA). These radars are used in the Joint Surveillance System (JSS) that provides data and communications to both FAA and U.S. Air Force operational centers. The most recent long-range search radar in the JSS is the Air Route Surveillance Radar Model 4 (ARSR-4), fielded in the mid 1990's. These systems provide air defense and air traffic control for the continental United States, Guam, and Hawaii.
The FAA maintains several versions of Air Route Surveillance Radars (ARSRs) for air traffic control. These radars include the ARSR-1, ARSR-2, ARSR-3, and the ARSR-4.

I doubt that its any more than just that. Much of the FAA equipment is old and decrepid. In the early 90's, the FAA started infusing cash into new systems and and abandoning other sites including flight delivery systems. The Air Force has basically funded many of the new projects dealing with space and has made it clear that it is the Air and Space Force.