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Uncertain, Texas
Inside Uncertain's city limits, shrink-swell clay limits houses without basements on 63% of mapped land, the 2nd-highest of 5 cities in Harrison County. A shallow water table limits basements on 77%, the highest of 5 cities in Harrison County.
That clay share is above Harrison County's 24%. FEMA's flood data list 105 flood losses since 2016 in ZIP code 75661 overlapping the city. Of its 250 homes, 83% were built before 1980; the median dates from 1957.
Data as of October 13, 2026 · sources · in Harrison 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 Uncertain
Foundation repair in Uncertain: shrink-swell clay limits slab homes on 63% of Uncertain's mapped land, more than in 68% of Texas cities.
About 200 of Uncertain's 250 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 Uncertain city limits
| Expansive clay (limits slab homes) | 63.0% |
| High water table (limits basements) | 77.1% |
| Septic fields very limited | 95.8% |
| Clay swell (LEP, by area) | 6.2% |
| High-swell land (LEP 6%+) | 68.6% |
| Mapped soil | 347 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Scottsville | 42% | n/a |
| Eastwood | 20% | 99% |
| Latex | 15% | n/a |
| Metcalf | 6% | n/a |
| Bienville | 4% | n/a |
| Timpson | 4% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 6.2% by land area here, and 69% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 63% of the mapped land.
Clay shrinks as it dries: 100% of Harrison County is in drought on the latest map, and 63% of Uncertain's mapped land has shrink-swell clay.
On 77% of Uncertain's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 96% of the land very limited for septic absorption fields.
Drought in Harrison County
100% of Harrison 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 Uncertain. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 75661 | 100% | 105 | $3.3 million |
Homes in Uncertain
| Housing units | 250 |
| Median year built | 1957 |
| Built before 1980 | 83% |
| Built 2000 or later | 3% |
| Owner-occupied | 96% |
| Median value, owner-occupied | $181,300 |
| Single-family detached | 96% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Scottsville | 13 mi | 19% | 44% |
| Jefferson | 13 mi | 4% | 68% |
| Waskom | 16 mi | 69% | 71% |
| Marshall | 17 mi | 6% | 38% |
| Linden | 25 mi | 0% | 23% |
| Avinger | 28 mi | 0% | 37% |
| Atlanta | 29 mi | under 1% | 49% |
| Hallsville | 29 mi | 26% | 71% |
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