National Museum of American History, Behring Center

Lighthouse Postcards

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Mile Rocks postcard face - click to enlarge

Mile Rocks postcard obverse - click to enlarge

Locate on NOAA nautical chart

Mile Rocks

State: CA
Year established: 1906
Latitude: 37 deg 47 min 33 sec N
Longitude: 122 deg 30 min 34 sec W
Height above sea level: 49 feet

Original construction:
white caisson with orange bands

1966: lantern room and top 2 tiers of lighthouse dismantled and light replaced by rotating aero beacon; helicopter pad placed on top of tower foundation

automated in 1966, active aid to navigation

Light characteristic:
flashing white every 5 seconds, visible for 15 nautical miles, horn: 1 blast every 30 seconds lasting 2 seconds

More information:
U.S. Department of Homeland Security / United States Coast Guard, Light List, Volume 6 Pacific Coast and Pacific Islands, Pacific Coast and Outlying Pacific Islands, (Washington, DC: GPO, 2004), p. 5
Shanks Jr., Ralph C., Lighthouses of San Francisco Bay, (San Anselmo, CA: Costano Books, 1976), p. 65