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Wixon Valley, Texas
Inside Wixon Valley's city limits, shrink-swell clay limits houses without basements on 73% of mapped land, the highest of 4 cities in Brazos County. A shallow water table limits basements on 42%, the 2nd-highest of 4 cities in Brazos County.
That clay share is above Brazos County's 57%. FEMA's flood data list 15 flood losses since 2016 in ZIP code 77808 overlapping the city. Of its 106 homes, 44% were built before 1980; the median dates from 1986.
Data as of October 13, 2026 · sources · in Brazos 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 Wixon Valley
Foundation repair in Wixon Valley: shrink-swell clay limits slab homes on 73% of Wixon Valley's mapped land, more than in 77% of Texas cities.
About 100 of Wixon Valley's 106 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 Wixon Valley city limits
| Expansive clay (limits slab homes) | 72.6% |
| High water table (limits basements) | 41.5% |
| Septic fields very limited | 81.0% |
| Clay swell (LEP, by area) | 7.0% |
| High-swell land (LEP 6%+) | 73.2% |
| Mapped soil | 1,161 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Boonville | 26% | n/a |
| Zack | 20% | n/a |
| Zulch | 20% | n/a |
| Tabor | 6% | n/a |
| Padina | 6% | n/a |
| Robco | 5% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 7.0% by land area here, and 73% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 73% of the mapped land.
Clay shrinks as it dries: 100% of Brazos County is in drought on the latest map, and 73% of Wixon Valley's mapped land has shrink-swell clay.
On 42% of Wixon Valley's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 81% of the land very limited for septic absorption fields.
Drought in Brazos County
100% of Brazos 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 Wixon Valley. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 77808 | 100% | 15 | $829,848 |
Homes in Wixon Valley
| Housing units | 106 |
| Median year built | 1986 |
| Built before 1980 | 44% |
| Built 2000 or later | 32% |
| Owner-occupied | 99% |
| Median value, owner-occupied | $275,000 |
| Single-family detached | 73% |
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