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Downtown in Sacramento in Sacramento County, California — The American West (Pacific Coastal)
 

Sacramento Air Defense Filter Center

 
 
Sacramento Air Defense Filter Center Marker image. Click for full size.
Photographed by Sean P. Flynn, February 9, 2025
1. Sacramento Air Defense Filter Center Marker
Inscription. Sacramento Air Defense Filter Center in Memorial Auditorium shows group of volunteers working around plotting tables.
(Joseph Benetti collection) Sacramento Archives and Museum Collection Center

 
Topics. This historical marker is listed in these topic lists: CommunicationsMilitary.
 
Location. 38° 34.73′ N, 121° 29.194′ W. Marker is in Sacramento, California, in Sacramento County. It is in Downtown. It is on 15th Street north of J Street, on the right when traveling south. Touch for map. Marker is in this post office area: Sacramento CA 95814, United States of America. Touch for directions.

Regionally, this marker is in Sacramento Valley and specifically in the Central Valley. It is also on the American Pacific Coast. Globally, it is in North America, on the Ring of Fire, in the Pacific Rim, in the Western Hemisphere, in the Western World, and in the Anglosphere. Historically, it finds itself in what was once New Spain and also Mexico’s Alta California.

Other nearby markers. At least 8 other markers are within walking distance of this marker: Boxing at the Sacramento Memorial Auditorium (here, next to this marker); The Shrine/Polack Bros. Circus (here, next to this marker); Arts and Entertainment at the Sacramento Memorial Auditorium (a few steps from this marker); The Messiah, 1928 (a few steps from this marker); Banquet at Sacramento Memorial Auditorium (a few steps from this marker); Sacramento Memorial Auditorium (a few steps from this marker); Bell Labs Sea Plow (within shouting distance of this marker); First Commercial Modem (within shouting distance of this marker). Touch for a list and map of all markers in Sacramento.
 
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The marker and photo is one of a set of 29 found around two A&T-owned buildings along 14th, J and 15th Streets.
 
Regarding Sacramento Air Defense Filter Center. "Filter centers" were developed as part of the defense systems set up to protect U.S. air space during World War II and in the Cold War. Civilian observations would be telephoned to filter centers, which would relay that information to air defense teams.
 
Also see . . .
1. Filter Centers.
Excerpt: "Filter centers were in charge of receiving all the reports from the observation posts, filtering those reports, tracking aircraft, and alerting the Air Defense Directive Center of possible hostile aircraft. They were also in charge of keeping all the records from GOC observation posts, distributing promotional, recruitment, and training materials, as well as fielding calls from the general public. Filter centers were manned by a joint Civil Defense-Air Force team comprised of active duty Air Force personnel as well as a staff of volunteers with the GOC. Each filter center could have around 300 observation posts under its direction."
(Submitted on February 13, 2025, by Sean P. Flynn of Oak Park, Illinois.) 

2. Ground Observer Corps (Wikipedia). (Submitted on February 13, 2025, by Sean P. Flynn of Oak Park, Illinois.)
 
Sacramento Air Defense Filter Center Marker image. Click for full size.
Photographed by Sean P. Flynn, February 9, 2025
2. Sacramento Air Defense Filter Center Marker
7 photos and markers along 15th Street image. Click for full size.
Photographed by Sean P. Flynn, February 7, 2025
3. 7 photos and markers along 15th Street
In all, 29 photos with small captions can be found around two adjoining AT&T buildings, along 14th, 15th and J Streets.
Sacramento Memorial Auditorium image. Click for full size.
Photographed by Sean P. Flynn, February 7, 2025
4. Sacramento Memorial Auditorium
A small section of the AT&T building where this marker is found can be seen on the far left of the photo.
 
 
Credits. This page was last revised on February 13, 2025. It was originally submitted on February 13, 2025, by Sean P. Flynn of Oak Park, Illinois. This page has been viewed 157 times since then and 10 times this year. Photos:   1, 2, 3. submitted on February 13, 2025, by Sean P. Flynn of Oak Park, Illinois.   4. submitted on February 11, 2025, by Sean P. Flynn of Oak Park, Illinois.
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Jun. 6, 2026