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Walnut Springs, Texas
Inside Walnut Springs' city limits, shrink-swell clay limits houses without basements on 64% of mapped land, the highest of 7 cities in Bosque County. A shallow water table limits basements on 0%.
That clay share is above Bosque County's 29%. FEMA's flood data list no flood losses since 2016 in ZIP code 76690 overlapping the city. Of its 398 homes, 43% were built before 1980; the median dates from 1986.
Data as of October 13, 2026 · sources · in Bosque 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 Walnut Springs
Foundation repair in Walnut Springs: shrink-swell clay limits slab homes on 64% of Walnut Springs' mapped land, more than in 68% of Texas cities.
About 300 of Walnut Springs' 398 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 Walnut Springs city limits
| Expansive clay (limits slab homes) | 63.5% |
| High water table (limits basements) | 0.0% |
| Septic fields very limited | 73.2% |
| Clay swell (LEP, by area) | 7.6% |
| High-swell land (LEP 6%+) | 67.6% |
| Mapped soil | 860 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Krum | 62% | n/a |
| Denton | 10% | n/a |
| Purves | 8% | 40% |
| Cranfill | 6% | n/a |
| Frio | 4% | n/a |
| Venus | 4% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 7.6% by land area here, and 68% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 64% of the mapped land.
Clay shrinks as it dries: 100% of Bosque County is in drought on the latest map, and 64% of Walnut Springs' mapped land has shrink-swell clay.
USDA rates 73% of the land very limited for septic absorption fields.
Drought in Bosque County
100% of Bosque 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 Walnut Springs. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 76690 | 98% | 0 | $0 |
Homes in Walnut Springs
| Housing units | 398 |
| Median year built | 1986 |
| Built before 1980 | 43% |
| Built 2000 or later | 34% |
| Owner-occupied | 68% |
| Median value, owner-occupied | $81,700 |
| Single-family detached | 70% |
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