Public Land Survey System(PLSS)

The Public Land Survey System (PLSS) was developed by the Continental Congress to replace the common practice of describing land by metes and bounds.

The PLSS is also called the Rectangular System of Land Description.

• The metes and bounds system was developed in Europe over a period of many years.

• It uses natural land marks and low precision measuring to define boundaries.

• A typical metes and bounds description could read:

“From the point on the north bank of Muddy Creek one mile above the junction of Muddy and Indian Creeks, north for 400 yards, then northwest to the large standing rock, west to the large oak tree, south to Muddy Creek, then down the center of the creek to the starting point.”

http://en.wikipedia.org/wiki/Public_Land_Survey_System#Applying_the_system

Problems with the metes and bounds system

* Irregular shapes for properties make for much more complex descriptions.

* Over time, these descriptions become problematic as trees die or streams move by erosion.

* It wasn’t useful for the large, newly surveyed tracts of land being opened in the west, which were being sold sight unseen to investors.

Do we still use the metes and bounds system?Yes

It is used for irregular shaped parcels of land.

Instead of visual description of landmarks, angles and distances are used.

Public Land Surveying System (PLSS)

The beginning of the current day PLSS occurred with the passage of the Land Ordnance Act of 1785.

Land Ordnance Act of 1785

Purpose: To facilitate disposal (either via sale or simple giveaways) of lands west of the Appalachian Mountains that the U.S. government had acquired from the British after the end of the Revolutionary War.

1. U.S. soldiers had been promised land in return for their service during the Revolutionary War,

2. The government needed the money from the land sales (there was no tax system in place at that time),

3. Settlers were needed in the western lands to defend the nation's frontier from ongoing Indian attacks.

Disposing of this land was a very high priority for the young U.S. Government, for several reasons:

The first use of the PLSS was Ohio.

This system was changed before the PLSS was applied to the great plains and other areas.

PLSS Use

PLSS Terminology

Initial PointThe first step in the PLSS, rectangular system, was the establishment of the initial point within the territory.

Star sights where the most common method used.

Initial points and Base lines In U.S.

The initial points for Oklahoma were established using star sights to establish the desired latitude and longitude.

Indian Meridian: Latitude 34-29-32, Longitude 97-14-49

Cimarron meridian: Latitude 36-30-05, Longitude 103-00-07

Base lineThe next step was to establish a baseline.

The baseline passes through the initial point.

It could not be a straight line because all points along the line are an equal distance from the north pole.

In some surveys the base line was adjusted for curvature every 9 miles.

The base line was established to the east and to the west from the initial point, border to border across the territory being surveyed.

Prime Meridian

• Meridians are geographic lines

that pass through both poles and

divide the earth into sections.

• Many initial points were picked so

they were on a principle meridian.

• These are also call the prime

meridian.

Standard Parallels

Standard parallels are East-

West lines that are parallel to

the base line.

They are numbered north and

south of the base line.

Standard parallels are 24 miles

apart.

Guide Meridians

• Guide meridians are established

at 24 mile intervals along the

base line and standard parallels.

• Guide meridians are not parallel

to the principle meridian

because they are 90o to the

base line, or standard parallel

and the base line is curved.

• Guide meridians are not

continuous. There is an offset at

each standard parallel (24

miles).

Guide Meridians--cont.

Guide meridians can not be perpendicular to the base line and parallel to each other because the base line is curved.

Township

A pair of standard parallels and a pair of guide meridians forms a quadrangle.

Each quadrangle is divided into 16 townships.

Townships are identified by tier and row.

Section

Each township is divided into

36 sections.

The sections are numbered in

a serpentine route starting at

the upper right corner of the

township.

Fractions of Section

Fractions of 1/2 and 1/4 are

used to describe parts of a

section.

Irregular lots caused by

drainage ways, or other

reasons, are numbered.

Determine the descriptions for each of the labeled areas.

A: SE1/4, S23, T4S, R6W, IM

B:

SE1/4, SW1/4, NW1/4, S23, T4S, R6W, IM

C: SE1/4, NW01/4, NW1/4 & SW1/4, NW1/4 NE1/4, S23, T46, R6 W, IM

D: S8, T46, R6 W, IM

Sometimes it helps to draw the lines on the section.

DETERMINE THE DESCRIPTION FOR EACH AREA.

A: N1/2, NW1/4, S21, T7S, R6E, IM

B: SW1/4, NE1/4, S21, T7S, R6E, IM

C: SE1/4, SW1/4 & SW14, SE1/4, S21, T7S, R6E, IM

D: SW1/4, NW1/4, SW1/4, S21, T7S, R6E, IM

ADDITIONAL INFORMATION