Uintah meridian

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U.S. Bureau of Land Management map showing the principal meridians in Utah USBLM meridian map Utah.jpg
U.S. Bureau of Land Management map showing the principal meridians in Utah

The Uintah meridian has a center point north of Roosevelt, Utah. The Uintah meridian was established in 1875, and governs land surveys in the Uintah and Ouray Indian Reservation in the state of Utah.


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Michigan meridian

The Michigan meridian is the principal meridian used as a reference in the Michigan Survey, the survey of the U.S. state of Michigan in the early 19th century. It is located at 84 degrees, 21 minutes and 53 seconds west longitude at its northern terminus at Sault Ste. Marie, and varies very little from that line down the length of the state.

San Bernardino meridian

The San Bernardino meridian, established in 1852, is one of three principal meridians in the state of California. Because of the state's shape, three meridian–baseline sets are required for surveys in all parts of the state. The San Bernardino meridian is used for Southern California, and some townships in Arizona are also referenced to it.

Mount Diablo meridian

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. Mount Diablo also marks the baseline at latitude 37°52′54″N.

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, 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. This principal meridian was established in 1853.

The Choctaw meridian is a meridian that governs the surveys in most of central Mississippi, USA. It begins on the Choctaw baseline, latitude 31° 54' 40" north, longitude 90° 14' 45" west from Greenwich and runs north to the south boundary of the Chickasaw cession, at latitude 34° 19' 40" north.

First principal meridian

The first principal meridian is a meridian that began at the junction of the Ohio River and Great Miami River. It extends north on the boundary line between the states of Ohio and Indiana, and roughly approximates to the meridian of longitude 84° 48′ 50″ west from Greenwich. The ranges of the public surveys in the state of Ohio, west of the Scioto River, are numbered from this meridian.

Second principal meridian

The second principal meridian, or Paoli Meridian, coincides with 86° 28′ of longitude west from Greenwich, starts from a point two and one half miles west of the confluence of the Little Blue and Ohio rivers, runs north to the northern boundary of Indiana, and, with the base line in latitude 38° 28′ 20″, governs the surveys in Indiana and part of those in Illinois.

Fourth principal meridian

The fourth principal meridian, set in 1815, is the principal meridian for land surveys in northwestern Illinois and west-central Illinois, and its 1831 extension is the principal meridian for land surveys in Wisconsin and northeastern Minnesota. It is part of the Public Land Survey System that covers most of the United States.

The Sixth principal meridian at 97°22′08″W extends from the baseline coincident with the north boundary of Kansas in latitude 40°N south through the state to its south boundary in latitude 37°N and north through Nebraska to the Missouri River and governs the surveys in Kansas and Nebraska; the surveys in Wyoming except those referred to the Wind River meridian and base line, which intersect in latitude 43°01′20″N and longitude 108°48′40″W from Greenwich; the surveys in Colorado except those projected from the New Mexico and Ute meridians the latter intersecting its baseline in latitude 39°06′40″N and longitude 108°33′20″W from Greenwich; and the surveys in South Dakota extended or to be extended over the tract embracing the Pine Ridge and Rosebud Indian Reservations.

Tallahassee meridian Meridian of longitude

The Tallahassee meridian, in longitude 84° 16′ 37.59″ west from the prime meridian at Greenwich, runs north and south from the initial point on the base line at Tallahassee, in latitude 30° 26′ 04.12″ north, and as a principal meridian governs the surveys in Florida and Alabama as part of the Public Land Survey System.

Saint Stephens meridian

The Saint Stephens meridian, in longitude 88° 02′ west from Greenwich, begins at the initial point, on the base line, in latitude 31° north, passes through Saint Stephens, Alabama, extends south to Mobile Bay and north to latitude 33° 06′ 20″, and governs the surveys in the southern district of Alabama, and in Pearl River district lying east of the river and south of the Choctaw Baseline, in latitude 31° 52′ 40″ north, in the state of Mississippi.

Huntsville meridian

The Huntsville meridian begins on the northern boundary of Alabama, in latitude 34° 59′ 27" north, longitude 86° 34′ 16″ west from Greenwich, extends south to latitude 33° 06′ 20″ north, and governs the surveys in the northern district of Alabama.

Saint Helena meridian

Saint Helena meridian begins at the initial point of the Washington meridian, in latitude 31° north, and longitude 91° 09′ 15″ west of Greenwich, passing one mile east of Baton Rouge, extends south to the Mississippi River, and governs the surveys in the Greensburg and southeastern districts of Louisiana, east of the Mississippi River.

Louisiana meridian

The Louisiana meridian, in longitude 92° 24′ 15″ west of Greenwich, extends from the Gulf of Mexico to the north boundary of Louisiana, and with the baseline through the initial point conforming to the parallel of 31° north latitude, governs all the surveys in the state west of the Mississippi River.

New Mexico meridian Line of longitude used in geographic surveys

The New Mexico meridian, is longitude 106° 53′ 40″ west from Greenwich. It extends throughout New Mexico and into Colorado, and together with the baseline, at latitude 34° 15′ 25″ north, governs township and range surveys in New Mexico, except those in the northwest corner of the state which refer to the Navajo meridian and baseline. The New Mexico meridian and Baseline also provide the basis for township and range surveys in the upper valley of the Rio Grande del Norte in Colorado.

Salt Lake meridian

The Salt Lake meridian, established in 1855, in longitude 111° 54′ 00″ west from Greenwich, has its initial point at southeast corner of Temple Square, in Salt Lake City, Utah, extends north and south through the state, and, with the base line, through the initial, and coincident with the parallel of 40° 46′ 04″ north latitude, governs the surveys in the territory, except those referred to the Uintah meridian and Baseline projected from an initial point in latitude 40° 26′ 20″ north, longitude 109° 57′ 30″ west from Greenwich.

The Boise meridian is one of the 35 principal meridians of the Public Land Survey System of the United States. Adopted in 1867, its longitude is 116° 23′ 35″ west from Greenwich and its principal baseline is latitude 43° 22′ 21″ north. The meridian and baseline intersect approximately 19 miles (31 km) from Boise, between the Snake River and the Boise River. The Boise meridian governs land surveys in the state of Idaho.

Indian meridian United States historic place

The Indian meridian, in longitude 97° 14′ 30″ west from Greenwich, extends from Red River to the south boundary of Kansas, and, with the base line in latitude 34° 30′ north, governs the surveys in Oklahoma east of 100° west longitude from Greenwich.

Ute meridian

The Ute meridian, also known as the Grand River meridian, was established in 1880 and is a principal meridian of Colorado. The initial point lies inside the boundaries of Grand Junction Regional Airport, Grand Junction, Colorado.

The Washington Meridian is one of the 38 principal meridians governing cadastral surveys in the United States. The meridian line was surveyed and established in 1803 by surveyor Isaac Briggs. Briggs named the meridian the Washington Meridian, likely because the meridian passed near his offices in the community of Washington, Mississippi.


    See also

    Coordinates: 40°25′58.44″N109°56′7.54″W / 40.4329000°N 109.9354278°W / 40.4329000; -109.9354278