| 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. |