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Benjamin, Texas
Inside Benjamin's city limits, shrink-swell clay limits houses without basements on 87% of mapped land, the highest of 4 cities in Knox County. A shallow water table limits basements on 0%.
That clay share is above Knox County's 27%. FEMA's flood data list no flood losses since 2016 in ZIP code 79505 overlapping the city. Of its 130 homes, 69% were built before 1980; the median dates from 1955.
Data as of October 13, 2026 · sources · in Knox 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 Benjamin
Foundation repair in Benjamin: shrink-swell clay limits slab homes on 87% of Benjamin's mapped land, more than in 95% of Texas cities.
About 100 of Benjamin's 130 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 Benjamin city limits
| Expansive clay (limits slab homes) | 87.4% |
| High water table (limits basements) | 0.0% |
| Septic fields very limited | 90.8% |
| Clay swell (LEP, by area) | 7.2% |
| High-swell land (LEP 6%+) | 87.4% |
| Mapped soil | 672 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Tillman | 52% | 93% |
| Hollister | 28% | n/a |
| Vernon | 7% | n/a |
| Mangum | 4% | n/a |
| Wichita | 3% | n/a |
| Tilvern | 1% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 7.2% by land area here, and 87% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 87% of the mapped land.
Clay shrinks as it dries: 100% of Knox County is in drought on the latest map, and 87% of Benjamin's mapped land has shrink-swell clay.
USDA rates 91% of the land very limited for septic absorption fields.
Drought in Knox County
100% of Knox 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 Benjamin. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 79505 | 100% | 0 | $0 |
Homes in Benjamin
| Housing units | 130 |
| Median year built | 1955 |
| Built before 1980 | 69% |
| Built 2000 or later | 0% |
| Owner-occupied | 60% |
| Median value, owner-occupied | $62,900 |
| Single-family detached | 82% |
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