Public Land Survey System

New Mexico Meridian

The New Mexico Principal Meridian, lying in 106°53’40”W longitude, controls all PLSS surveys in New Mexico and in the upper valley of the Rio Grande del Norte in Colorado. Established in 1855 by Deputy Surveyor John W. Garretson, the Initial Point of the New Mexico Meridian lies approximately ten miles south of the mouth of the Rio Puerco, on Black Butte just southeast of the village of San Acacia, New Mexico. The principal base line extends east and west from this initial point in 34°15'25"N latitude. Ranges were run both east and west of the New Mexico principal meridian, and survey townships were run both north and south of the New Mexico principal base line.