GAP-FILLER OPERATIONAL NOTES
MT. HEBO AFS (689TH RADAR SQUADRON)
1 Jan 60 TO 30 Jun 65

DATE MILESTONES AND/OR EVENTS as of 29 Apr 03
1 Jan 60 General Site Z-100 Mt. Hebo AFS continues operation as part of the Portland Air Defense Sector (Adair AFS, OR), 25th Air Division (McChord AFB, WA), Air Defense Command (ADC), USAF. Two Gap-Filler Sites: Z-100A at Washougal, WA, and Z-100B at Philomath, OR (Marys Peak).
  Z-100A Washougal, WA specifics
22 Dec 60 Gap-Filler Site at Z-100A Washougal, WA partially shut down (lack of personnel).
31 Mar 61 Gap-Filler Site Z-100A Washougal, WA antenna lowered for safety and site inactive.
31 Dec 61 Gap-Filler Site at Z-100A Washougal, WA inventoried.
31 Aug 63 Rigid radome installed by GEEIA on the FPS-18 Gap Filler radar at site Z-100A Washougal, WA. Site active.
30 Sep 63 Depot-Level Maintenance of radar systems at Gap Filler site Z-100A Washougal, WA.
31 Dec 63 Radar data from the FPS-18 (Gap Filler radar at Z-100A Washougal, WA) connected to the Semi-Automatic Ground Environment (SAGE) system.
15 Apr 64 Gap-Filler site at Z-100A Washougal, WA declared excess. No other Gap-Filler equipment or sites active with Z-100 Mt Hebo AFS at this time.
  Z-100B Philomath (Marys Peak), OR specifics
30 Apr 60 Gap-Filler Site Z-100B Philomath OR (Marys Peak) shut down.
30 Jun 61 Equipment at Gap-Filler Site Z-100B Philomath OR turned in and site deactivated.