Montana meridian
The Montana meridian extends north and south from the initial monument on the summit of a limestone hill, high, longitude 111° 39′ 33″ west from Greenwich, and, with the base line on the parallel of 45° 47′ 13″ north latitude, governs the surveys in the state of Montana. The initial point lies near Willow Creek, Montana. See also List of principal and guide meridians and base lines of the United States References Sources External links Meridians and base lines of the United States Named meridians Geography of Montana