Mount Diablo meridian, Principal meridian at Mount Diablo, California
The Mount Diablo Meridian extends north and south from the initial point at the summit, marking geographical coordinates at 37.881667°N and -121.914167°W.
Established in 1851, this meridian became fundamental for the U.S. Public Land Survey System, supporting land division across northern California and Nevada.
The summit beacon tower houses the initial point marker, with a concrete column extending through the structure to a viewing gallery topped by a brass plate.
The paved road leads to a parking area at the summit, where visitors can access the monument and museum within California State Park boundaries.
A copper bolt from an 1876 triangulation station marks the survey point, located three feet northeast of the concrete pillar under the museum floor.
Location: California
GPS coordinates: 37.88167,-121.91417
Latest update: March 11, 2025 12:08
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