The Humboldt meridian in California, longitude 124° 07' 10" west from Greenwich, intersects the base line on the summit of Mount Pierce at latitude 40° 25' 02" north (co-ordinates in NAD27 datum), and governs the surveys in the northwestern corner of California, lying west of the Coast Range of mountains, and north of township 5 south, of the Humboldt meridian system.Plane Surveying for Use in the Classroom and Field By William Galt Raymond This principal meridian was established in 1853.Part 5: Public Land Survey System Standards for USGS and USDA Forest Service Single Edition Quadrangle Maps (5/03)
See also List of principal and guide meridians and base lines of the United States
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