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The Mount Diablo Meridian, established in 1851, is a principal meridian extending north and south from its initial point atop Mount Diablo in California at W 121° 54.845. Established under the U.S. Public Land Survey System , it is used to describe lands in most of northern California and all of Nevada . [ 1 ]
Primarily from the United States Government Printing Office Style Manual. [1] State names usually signify only parts of each listed state, unless otherwise indicated. Based on the BLM manual's 1973 publication date, and the reference to Clarke's Spheroid of 1866 in section 2-82, coordinates appear to be in the NAD27 datum.
In 2007 Save Mount Diablo published Mount Diablo, Los Vaqueros & Surrounding Parks, Featuring the Diablo Trail, the most accurate and up-to-date map of Mount Diablo's more than 90,000 acres (36,000 ha) of protected lands. It includes 100 access points, 520 miles (840 km) of trail, and 400 miles (640 km) of private fire roads.
Thus, for example, the description "T1SR20E S13 MDM" reads as follows: Township 1 South, Range 20 East, Section 13, Mount Diablo Meridian. That is, the 13th section in the first township south of the baseline (in this case, the Mount Diablo Baseline) and the 20th township east of the principal meridian (the Mount Diablo Meridian).
The meridian meets its corresponding baseline at the point of origin, or initial point, for the land survey. For example, the Mount Diablo Meridian, used for surveys in California and Nevada, runs north–south through the summit of Mount Diablo.
As an example, the first established initial point in California was the Mount Diablo meridian. It was chosen because the summit of Mount Diablo could be seen for many miles around and could be referenced for surveys. [1] In other cases, a meridian and a base line were chosen separately based on other geographical features.
University of Nevada, Reno. Archived from the original (Background and maps of the San Bernardino and Mt. Diablo meridians) on 2012-10-18; Michael A. Duffy, PLS. "Three Monuments, One Initial Point" (Published in the September 2002 Issue #135 of the California Surveyor). Mount Diablo Surveyors Historical Society
The sixth standard parallel south of Mount Diablo Range at 35°48′ north, 13.8344 miles south of the 36th parallel, forms a continuous boundary between the California counties of Monterey, Kings, Tulare, and Inyo on the north and the counties of San Luis Obispo, Kern, and San Bernardino on the south. [4]