TWDB Well Location Grid

Date(s): Coverage Availability/Geographic Extent: Footprint: Source(s):
2015 Statewide State TWDB

Data Access

Direct Download

The full TWDB Well Location Grid data set can be downloaded directly.

Download the 4.1 MB file here:


Data Details

Reference Grid
Available Formats: Shapefile
Known Issues: None
Recommended Uses: Planning, analysis, cartography
Spatial Reference:

EPSG 4269


To facilitate the location of wells and avoid duplication of well numbers, a statewide well-numbering system has been adopted. It is based on division of the State into a grid of 1-degree quadrangles formed by degrees of latitude and longitude and the repeated division of these quadrangles into smaller ones.

  • Each 1-degree quadrangle is divided into sixty-four 7 1/2-minute quadrangles, each of which is further divided into nine 2 1/2-minute quadrangles.
  • Each 1-degree quadrangle in the State has been assigned an identification number.
  • The 7 1/2-minute quadrangles are numbered consecutively from left to right, beginning in the upper left-hand corner of the 1-degree quadrangle and the 2 1/2-minute quadrangles within each 7 1/2-minute quadrangle are similarly numbered.
  • The first 2 digits of a well number identify the 1-degree quadrangle; the third and fourth digits, the 7 1/2-minute quadrangle; and the fifth digit identifies the 2 1/2-minute quadrangle.