Overview & History

Overview#

The Public Land Survey System (PLSS) is the rectangular survey framework established by the United States government to subdivide public domain lands for orderly disposition, settlement, and administration. It is the largest cadastral survey system ever undertaken, covering approximately 1.5 billion acres across 30 states. Every chain of title in those states traces back to a federal land patent, and every patent traces back to an original cadastral survey that created -- not merely located -- the boundaries described in that patent.

Understanding the PLSS is not optional for surveyors working in public domain states. The system's structure, its monuments, and the rules governing their retracement are governed by federal law and the Manual of Surveying Instructions, which remains the authoritative guide to cadastral survey practice.

"Security of legal title to land, one of the bulwarks of our basic freedoms, is the fundamental object of the cadastral surveyor's work and of this Manual." -- BLM, Manual of Surveying Instructions (2009), Sec. 1-2

Origins of the Rectangular Survey#

The Problem of Land Disposal

After the American Revolution, the newly independent United States faced a practical problem: how to dispose of the vast public domain acquired through cessions from the original colonies and from foreign powers. The western lands had to be surveyed, described, and conveyed in a systematic way that would prevent the overlapping claims and boundary disputes that plagued the metes-and-bounds system used in the original colonies.

The solution was a rectangular survey system -- a grid imposed on the landscape before settlement, creating uniform, identifiable parcels that could be described by a simple notation and located on the ground by permanent monuments.

The Land Ordinance of 1785

The foundational legislation was the Land Ordinance of May 20, 1785, passed by the Continental Congress while the Articles of Confederation were still in effect. This ordinance established the principle that public lands would be surveyed into townships of 36 square miles, each subdivided into sections of one square mile (640 acres), before any disposal could take place.

"Prior to the Constitution's adoption in 1788 and while the Articles of Confederation (1781) were still in effect, the Congress passed the Land Ordinance of 1785, establishing a system for surveying and thereby demarcating the public lands for their (1) orderly disposition into new States, (2) conveyance from Federal into State and private ownership, or (3) retention for Federal administration." -- BLM, Manual of Surveying Instructions (2009), Sec. 1-1

The first surveys under this system began in eastern Ohio in 1785, under the direction of Thomas Hutchins, the Geographer of the United States. The first line surveyed was the Geographer's Line, begun on September 30, 1785. The first township plat was surveyed in 1786 by Absalom Martin.

Thomas Jefferson's Contribution

Thomas Jefferson is widely credited as the intellectual architect of the rectangular survey concept. His original proposal called for a decimal system of land division based on geographic (nautical) miles. While Congress modified the specifics -- adopting the 6-mile township and 640-acre section rather than Jefferson's proposed 10-mile squares -- the core idea of surveying before settlement, using a rectangular grid tied to cardinal directions, was Jefferson's.

The Northwest Ordinance of 1787

The Northwest Ordinance of July 13, 1787 complemented the Land Ordinance by establishing the political framework for governing the Northwest Territory (the region north of the Ohio River and east of the Mississippi). It provided for the creation of new states from the territory and guaranteed property rights within those states. Together, these two ordinances created the legal and survey framework that would govern westward expansion for over a century.

Evolution Through Early Surveys

Ohio served as the experimental area for the rectangular system. The early surveys in Ohio used several different starting points and numbering schemes as Congress and the Surveyors General refined the system through practical experience.

"Based on early laws, that part of the Northwest Territory that became the State of Ohio was the experimental area for the development of the rectangular system used by the PLSS. Here the plans and methods were tested in a practical way. Notable revisions of the rules were made as the surveys progressed westward until the general plan was complete." -- BLM, Manual of Surveying Instructions (2009), Sec. 1-10

The original 1785 surveys numbered sections from 1 in the southeast corner, running south to north. The modern serpentine numbering pattern (beginning in the northeast corner) was adopted in later legislation.

Authority and Administration#

The General Land Office

The Act of May 18, 1796 provided for the appointment of a Surveyor General to survey public lands northwest of the Ohio River. In 1812, the Commissioner of the General Land Office (GLO) assumed responsibility for issuing survey instructions. Eventually, a Surveyor General was appointed for each new surveying district as settlement moved westward.

"The Act of July 4, 1836, placed the overall direction of the public land surveys under the Principal Clerk of the Surveys under the direction by the Commissioner of the General Land Office." -- BLM, Manual of Surveying Instructions (2009), Sec. 1-10

The Bureau of Land Management

In 1946, the General Land Office was merged with the Federal Grazing Service to form the Bureau of Land Management (BLM), which assumed responsibility for the cadastral survey program. The BLM remains the federal agency responsible for official surveys and resurveys of the public lands to this day.

The Director of the Bureau of Land Management has the authority to determine what lands are federal interest lands, what lands have been surveyed, what remain to be surveyed, and what have been disposed of. This authority derives from Title 43 U.S.C. sections 2 and 1201.

The Role of the Surveyor General

Under the historical system, the Surveyor General of each district was responsible for directing the surveys within that district. The Surveyor General issued contracts to deputy surveyors who performed the actual field work under "special instructions" that specified the scope and requirements of each survey. This system of centralized authority and delegated execution ensured consistency across the vast public domain.

The 30 PLSS States#

The PLSS covers 30 of the 50 states. These are the "public domain states" -- states carved from territory acquired by the federal government, where title to all privately owned land traces back to a federal patent.

States NOT Covered by the PLSS

Twenty states were never surveyed under the PLSS. These fall into several categories:

"Land ownership and boundaries in the other 20 States, i.e., the Thirteen Original States plus Hawaii, Kentucky, Maine, Tennessee, Texas, Vermont, and West Virginia, were established by other means and surveyed according to different systems and standards." -- BLM, Manual of Surveying Instructions (2009), Sec. 1-1

These states use metes-and-bounds descriptions, with land titles tracing to colonial grants, state grants, or (in the case of Texas) grants from the Republic of Texas or earlier Spanish and Mexican grants.

Principal Meridians and Baselines#

Every PLSS survey originates from an initial point, where a principal meridian (running north-south along a true meridian of longitude) intersects a baseline (running east-west along a true parallel of latitude). Townships are numbered north and south from the baseline; ranges are numbered east and west from the principal meridian.

There are 37 principal meridians in the PLSS (plus the Fairbanks and other meridians in Alaska). Some serve a single state; others govern surveys across multiple states.

Note: Approximate coordinates are given for the initial points. Several Alaska meridians and some early Ohio meridians are not listed here.

The Manual of Surveying Instructions#

The Manual of Surveying Instructions is the authoritative guide to cadastral survey practice. It prescribes the procedures for establishing and reestablishing boundaries of federal interest lands. Every edition of the Manual is legally relevant because each governs the surveys executed under it.

"This Manual of Surveying Instructions (Manual) represents the latest in a series of official and binding survey instructions dating back to 1804; the most recent prior to this edition was issued in 1973." -- BLM, Manual of Surveying Instructions (2009), Sec. 1-2

Editions of the Manual

"Previous editions of the Manual were issued in 1855 (reprinted as the Manual of 1871), 1881, 1890, 1894, 1902, 1930, 1947, and 1973." -- BLM, Manual of Surveying Instructions (2009), Sec. 1-11

Each edition is relevant to modern practice because the survey that created a given boundary is governed by the Manual in force at the time that survey was executed. A surveyor retracing an 1870 survey must understand the instructions under which that survey was conducted.

Supplements to the Manual

The 2009 Manual is accompanied by several supplements:

• Restoration of Lost or Obliterated Corners and Subdivision of Sections -- a practical guide for county and local surveyors.
• Specifications for Descriptions of Tracts of Land for Use in Executive Orders and Proclamations -- guidance for writing legal descriptions.
• Glossary of BLM Surveying and Mapping Terms -- authoritative definitions.
• Mineral Survey Procedures Guide -- procedures for mineral lands surveys.

The Cadastral Survey Process#

Every official survey follows a defined process. Understanding this process is essential because each element of the record -- from the special instructions to the approved plat -- has legal significance.

"A cadastral survey creates or reestablishes, marks, and defines boundaries of tracts of land. Cadastral surveys referred to in this Manual are the official surveys of the United States." -- BLM, Manual of Surveying Instructions (2009), Sec. 1-4

The components of an official survey include:

1. Request for survey -- a formal request from a federal agency, state, or other authorized entity.
2. Special instructions -- specific directions governing the scope and requirements of the survey.
3. Field notes -- the official record of all observations, measurements, and monuments established.
4. Plat -- the official map depicting the surveyed boundaries, corners, and features.
5. Review and approval -- all surveys are subject to review and acceptance by the Director of the BLM.

"A cadastral survey is not complete until it is officially filed with the BLM as the culmination of this process." -- BLM, Manual of Surveying Instructions (2009), Sec. 1-4

The distinction between an official (cadastral) survey and a local or administrative survey is significant. An official survey is a formal decision by the federal government that creates or reestablishes legal boundaries. A local survey is an opinion on the location of a boundary. An administrative survey is a local survey made by a federal employee for administrative purposes.

"An official survey is distinct from a local survey or an administrative survey. A local survey is an opinion on the location of a boundary based on a survey that does not contain every element of an official survey." -- BLM, Manual of Surveying Instructions (2009), Sec. 1-5

The Fundamental Principle#

The PLSS rests on a principle that distinguishes it from all private survey systems: the original survey creates the boundaries. Once an official survey is accepted and filed, its monuments and lines are the legal boundaries, regardless of whether they conform perfectly to the theoretical plan.

"All the corners marked in the surveys, returned by the Secretary of the Interior or such agency as he may designate, shall be established as the proper corners of sections, or subdivision of sections, which they were intended to designate; and the boundary lines, actually run and marked in the surveys returned by the Secretary of the Interior or such agency as he may designate, shall be established as the proper boundary lines of the sections, or subdivisions, for which they were intended." -- Act of February 11, 1805 (2 Stat. 313; 43 U.S.C. 752), quoted in BLM, Manual of Surveying Instructions (2009), Sec. 6-1

This means that even if an original survey was imperfect -- if a section was not exactly 640 acres, or a line was not exactly on a cardinal bearing -- the survey as executed is the legal boundary. The surveyor's duty in retracement is not to correct the original survey but to recover its monuments and retrace its lines.

The consequence of this principle is profound: the boundaries of every parcel in a PLSS state are fixed by the original survey, and no subsequent survey -- however more accurate -- can displace them. The boundaries are where the original surveyor placed them, not where a modern instrument says they should be.

"The Manual prescribes the procedures and principles for establishing or reestablishing these boundaries. The instructions contained in this Manual will be observed by surveyors engaged in the execution of official Federal surveys. They are of utmost importance in maintaining a consistent and orderly survey system based upon certainty and predictability in survey procedures. A failure to follow the Manual may be considered an error." -- BLM, Manual of Surveying Instructions (2009), Sec. 1-5

Key Takeaways#

• The PLSS was established by the Land Ordinance of 1785 and covers 30 public domain states. Twenty states (the original 13 colonies plus Texas, Hawaii, and five states formed from colonial territory) are not covered.
• The system creates a rectangular grid of townships (6 miles square) and sections (1 mile square, 640 acres) referenced to principal meridians and baselines. There are 37 principal meridians.
• Administration passed from the General Land Office to the Bureau of Land Management in 1946. The BLM retains authority over all official surveys and resurveys.
• The Manual of Surveying Instructions has been issued in nine editions (1855--2009). Each edition governs the surveys executed under it. The 2009 edition is current.
• The original survey creates the legal boundaries. Retracement surveys seek to recover the original monuments, not to correct the original survey.
• Every chain of title in a PLSS state traces to a federal patent, which traces to an original cadastral survey. Understanding the system is essential for any surveyor working in these states.

References#

1. U.S. Department of the Interior, Bureau of Land Management. Manual of Surveying Instructions (2009). Chapter I: The General Plan.
2. Act of May 20, 1785 (Land Ordinance of 1785).
3. Act of July 13, 1787 (Northwest Ordinance).
4. Act of February 11, 1805 (2 Stat. 313; 43 U.S.C. 752).
5. Act of May 18, 1796 (Appointment of Surveyor General).
6. White, C. Albert. A History of the Rectangular Survey System. U.S. Department of the Interior, Bureau of Land Management, 1983.
7. Cazier, Lola. Surveys and Surveyors of the Public Domain, 1785--1975. U.S. Department of the Interior, Bureau of Land Management, 1976.