Information for Mount Hebo AFS, OR

Latitude: 45-12-57 N, Longitude: 123-45-28 W

Call Sign(s): Creature

Perm ID	Sage ID	Unit	Location	Early Equip.	Final Equip.	Oper. Date	Inact. Date	Notes
M-100	Z-100	689; Det. 2, 14 MWS	Mount Hebo AFS, OR	FPS-4; MPS-11; GPS-3; FPS-24; FPS-6,-6B/-90; FPS-26A (FSS-7)	FPS-27; FPS-90; (FSS-7)	1957	01-May-79	This site had one of only two AN/FPS-24's covered with a radome (first one burned, then replaced; next one blew off in storm, 1968). FPS-26A modified to FSS-7 radar. GATR retained until JSS switchover. Site now restored to natural state.
M-100A	Z-100A		Washougal, WA	FPS-18		Jun-60	Feb-64	Gap-Filler Annex. (ADC records state deactivation was Dec 60; maybe standby-status date?) Located atop Larch Mountain.
M-100B			Philomath, OR	FPS-18		Jun-60	early 1961	Gap-Filler Annex. Located on Marys Peak. (Marys Peak is the highest point in the Coast Range Mountains at 4097 feet.). Reportedly, never achieved operational status; site was deactivated after an ice storm toppled the antenna sail.

Perm ID

Sage ID

JSS ID

Unit

Location

Early
Equip.

Final
Equip.

Oper.
Date

Inact.
Date

Notes

M-100

Z-100

689; Det. 2, 14 MWS

Mount Hebo AFS, OR

FPS-4; MPS-11; GPS-3; FPS-24; FPS-6,-6B/-90; FPS-26A (FSS-7)

FPS-27; FPS-90; (FSS-7)

1957

01-May-79

This site had one of only two AN/FPS-24's covered with a radome (first one burned, then replaced; next one blew off in storm, 1968). FPS-26A modified to FSS-7 radar. GATR retained until JSS switchover. Site now restored to natural state.

M-100A

Z-100A

Washougal, WA

FPS-18

Jun-60

Feb-64

Gap-Filler Annex. (ADC records state deactivation was Dec 60; maybe standby-status date?) Located atop Larch Mountain.

M-100B

Philomath, OR

FPS-18

Jun-60

early 1961

Gap-Filler Annex. Located on Marys Peak. (Marys Peak is the highest point in the Coast Range Mountains at 4097 feet.). Reportedly, never achieved operational status; site was deactivated after an ice storm toppled the antenna sail.

History of Mount Hebo AFS, OR

The 689th AC&W Squadron began operations with AN/FPS-4 and AN/FPS-6 height-finder radars and an AN/MPS-11 search radar in 1957. In the late 1950s an AN/GPS-3 search radar replaced the AN/MPS-11. The AN/FPS-4 radar subsequently was replaced by an AN/FPS-6B set. By 1963 the 689th Radar Squadron (SAGE) began operating an AN/FPS-24 search radar, and AN/FPS-26 and AN/FPS-90 height-finder radars; the AN/MPS-11 search radar was retired later that year. Mt. Hebo became an FAA/ADC joint-use facility around 1966. Also that year, the AN/FPS-26A height-finder radar was converted into an AN/FSS-7 SLBM detection-and-warning radar, operated by Detachment 2 of the 14th Missile Warning Squadron (ADCOM). The AN/FPS-24 search radar was replaced in 1968 by an AN/FPS-27 set relocated from the recently-deactivated Miles City AFS, MT (Z-98), and with some radar components reportedly coming from San Pedro Hill AFS, CA (Z-39). The 689th Radar Squadron was deactivated 1 May 1979. Det 2, 14th MWS was deactivated Sep 1980.

References: "Searching the Skies"; misc. ADCOM documents; eyewitness accounts.

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