Mount Diablo Beacon:

Mount Diablo Beacon: (HM1RHI)

Location: Walnut Creek, CA 94598 Contra Costa County
Buy California State flags at!
Country: United States of America
Buy United States of America flags at!

N 37° 52.909', W 121° 54.858'

  • 0 check ins
  • 0 favorites

Left Dark by War, Lighted in Remembrance

A large flashing light atop this rotunda once guided airplanes flying through the night skies of the Bay Area. Originally held aloft on a 75-foot tower erected by Standard Oil in 1928, it served as a crucial route-finding aid in the days before electronic navigation. Civilian Conservation Corps workers crowned this building with a 10-million candlepower light before the outbreak of World War II. After the 1941 attack on Pearl Harbor it was turned off amid fears it could guide the enemy in attacking the mainland.
Obsolete after the war, the beacon remained dark except for an annual December 7th lighting in memorial to those who died at Pearl Harbor.
Series This marker is part of the series
Placed ByCalifornia State Department of Parks and Recreation
Marker ConditionNo reports yet
Date Added Tuesday, April 5th, 2016 at 1:01pm PDT -07:00
Sorry, but we don't have a picture of this historical marker yet. If you have a picture, please share it with us. It's simple to do. 1) Become a member. 2) Adopt this historical marker listing. 3) Upload the picture.
Locationbig map
UTM (WGS84 Datum)10S E 595475 N 4193257
Decimal Degrees37.88181667, -121.91430000
Degrees and Decimal MinutesN 37° 52.909', W 121° 54.858'
Degrees, Minutes and Seconds37° 52' 54.54" N, 121° 54' 51.48" W
Driving DirectionsGoogle Maps
Area Code(s)925, 510, 707
Closest Postal AddressAt or near Summit Rd, Walnut Creek CA 94598, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

Is this marker missing? Are the coordinates wrong? Do you have additional information that you would like to share with us? If so, check in.

Check Ins  check in   |    all

Have you seen this marker? If so, check in and tell us about it.

Comments 0 comments

Maintenance Issues
  1. This markers needs some tags to help categorize the marker
  2. What historical period does the marker represent?
  3. What historical place does the marker represent?
  4. What type of marker is it?
  5. What class is the marker?
  6. What style is the marker?
  7. Does the marker have a number?
  8. What year was the marker erected?
  9. This marker needs at least one picture.
  10. Can this marker be seen from the road?
  11. Is the marker in the median?