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Clarksville, Texas
Inside Clarksville's city limits, shrink-swell clay limits houses without basements on 76% of mapped land, the 2nd-highest of 5 cities in Red River County. A shallow water table limits basements on 13%, the 5th-highest of 5 cities in Red River County.
That clay share is above Red River County's 61%. FEMA's flood data list no flood losses since 2016 in ZIP code 75426 overlapping the city. Of its 1,669 homes, 78% were built before 1980; the median dates from 1973.
Data as of October 13, 2026 · sources · in Red River 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 Clarksville
Foundation repair in Clarksville: shrink-swell clay limits slab homes on 76% of Clarksville's mapped land, more than in 81% of Texas cities.
About 1,300 of Clarksville's 1,669 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 Clarksville city limits
| Expansive clay (limits slab homes) | 76.4% |
| High water table (limits basements) | 13.4% |
| Septic fields very limited | 86.3% |
| Clay swell (LEP, by area) | 8.7% |
| High-swell land (LEP 6%+) | 76.4% |
| Mapped soil | 1,941 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Austin | 33% | 93% |
| Burleson | 15% | 84% |
| Houston Black | 12% | 91% |
| Cuthand | 10% | n/a |
| Trinity | 9% | n/a |
| Deport | 5% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 8.7% by land area here, and 76% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 76% of the mapped land.
Clay shrinks as it dries: 100% of Red River County is in drought on the latest map, and 76% of Clarksville's mapped land has shrink-swell clay.
USDA rates 86% of the land very limited for septic absorption fields.
Drought in Red River County
100% of Red River 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 Clarksville. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 75426 | 100% | 0 | $0 |
Homes in Clarksville
| Housing units | 1,669 |
| Median year built | 1973 |
| Built before 1980 | 78% |
| Built 2000 or later | 9% |
| Owner-occupied | 43% |
| Median value, owner-occupied | $53,700 |
| Single-family detached | 80% |
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