HomeTexasDallam CountyTexline
Texline, Texas
Inside Texline's city limits, shrink-swell clay limits houses without basements on 17% of mapped land. A shallow water table limits basements on under 1%.
That clay share is close to Dallam County's 15%. FEMA's flood data list no flood losses since 2016 in ZIP code 79087 overlapping the city. Of its 267 homes, 40% were built before 1980; the median dates from 1991.
Data as of October 13, 2026 · sources · in Dallam County
expansive clay: shrink-swell limits slab homes
high water table: limits basements
flood losses since 2016 in 1 overlapping ZIP
of homes built before 1980
Foundation repair in Texline
Foundation repair in Texline: shrink-swell clay limits slab homes on 17% of Texline's mapped land.
About 200 of Texline's 267 homes are detached houses.
| Who designs the repair | The ASCE Texas Section's repair guidelines say a Texas-licensed engineer should evaluate the foundation and design the repair (2022 guidelines) |
| Prices | Cost guide ranges compared |
Soil under Texline city limits
| Expansive clay (limits slab homes) | 17.0% |
| High water table (limits basements) | 0.4% |
| Septic fields very limited | 18.3% |
| Clay swell (LEP, by area) | 4.1% |
| High-swell land (LEP 6%+) | 0.0% |
| Mapped soil | 648 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Sunray | 46% | n/a |
| Conlen | 20% | n/a |
| Gruver | 18% | n/a |
| Dumas | 9% | n/a |
| Sherm | 3% | 95% |
| Plack | 2% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 4.1% by land area here, and 0% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 17% of the mapped land.
Clay shrinks as it dries: 13.2% of Dallam County is in drought on the latest map, and 17% of Texline's mapped land has shrink-swell clay.
Drought in Dallam County
13.2% of Dallam County is in drought (D1 or worse) on the October 13, 2026 map. County detail.
Flood losses by ZIP code
FEMA flood records since 2016 in the ZIP codes that overlap Texline. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 79087 | 100% | 0 | $0 |
Homes in Texline
| Housing units | 267 |
| Median year built | 1991 |
| Built before 1980 | 40% |
| Built 2000 or later | 42% |
| Owner-occupied | 68% |
| Median value, owner-occupied | $107,300 |
| Single-family detached | 61% |
Nearby cities
Sources: USDA SSURGO (August 5, 2026) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · Census ACS 2020-2024. Methods · Data status