HomeSoil seriesTillman
Tillman soil series
Tillman soils cover 1,097,345 mapped acres, mostly in Texas and Oklahoma. USDA rates shrink-swell a limit for houses without basements on 93% of that land, and a shallow water table a limit for basements on 0%.
It is the leading soil series by area in 12 of the counties and cities on this site, including Foard County, TX; Wilbarger County, TX; Hardeman County, TX.
SSURGO survey versions to August 5, 2026 · series description revised 2016-09
of its land: shrink-swell limits houses without basements
of its land: a shallow water table limits basements
median highest linear extensibility (6% and up is high)
median highest clay content in the top 150 cm
USDA's description
The Tillman series consists of very deep, well drained, slowly permeable soils. These soils formed in loamy and clayey alluvium derived from redbed clays and claystone sediments of Permian age. These soils are on nearly level to gently sloping alluvial plains and alluvial plain remnants of the Central Rolling Red Plains (MLRA-78C) and the Rolling Limestone Prairie (MLRA-78D). Slope ranges from 0 to 5 percent. The mean annual air temperature is 16 degrees C (61 degrees F) and the mean annual precipitation is 660 mm (26 in).
Source: USDA NRCS series description (OSD) for Tillman, revised 2016-09. Read it.
Engineering properties
| Mapped area (SSURGO) | 1,097,345 acres |
| Shrink-swell limits houses without basements | 93.5% |
| Shallow water table limits basements | 0.0% |
| Very limited for septic absorption fields | 93.5% |
| Most common drainage class | Well drained |
| Most common hydrologic soil group | C |
| Taxonomic class | Fine, mixed, superactive, thermic Vertic Paleustolls |
| Type location | Wilbarger County, Texas |
Where Tillman is mapped
| State | Mapped acres |
|---|---|
| Texas | 742,964 |
| Oklahoma | 354,381 |
Places where Tillman leads
Counties and cities where Tillman covers more mapped land than any other series.
| Place | Share of mapped land |
|---|---|
| Aspermont, TX | 87% |
| Electra, TX | 70% |
| Anson, TX | 69% |
| Quanah, TX | 64% |
| Benjamin, TX | 52% |
| Megargel, TX | 29% |
| Iowa Park, TX | 21% |
| Foard County, TX | 21% |
| Wilbarger County, TX | 15% |
| Hardeman County, TX | 14% |
| Haskell County, TX | 13% |
| Stonewall County, TX | 11% |
Other places where Tillman is a main soil
Counties and cities where Tillman is among the six soil series covering the most mapped land, but not the first. Share of the place's mapped land.
Counties
- Kiowa County, OK 14%
- Jones County, TX 11%
- Baylor County, TX 11%
- Wichita County, TX 11%
- Cotton County, OK 11%
- Tillman County, OK 9%
- Archer County, TX 8%
- Cottle County, TX 8%
- Jackson County, OK 7%
- Comanche County, OK 6%
- Knox County, TX 6%
- Childress County, TX 6%
- Fisher County, TX 6%
- Taylor County, TX 5%
Texas and Ohio cities
- Olney, TX 17%
- Merkel, TX 15%
- Holliday, TX 12%
- Tye, TX 12%
- Stamford, TX 6%
- Windthorst, TX 6%
- Seymour, TX 5%
- Spur, TX 3%
- Crowell, TX 3%
- Tuscola, TX 2%
- Lueders, TX 2%
Sources
Shares and properties: USDA NRCS SSURGO via Soil Data Access, weighted by each component's share of its map units. Description: the USDA NRCS series description. How we count.