Bryan County, Oklahoma
Shrink-swell clay limits houses without basements on 42% of Bryan County's mapped land, a higher share than 88% of US counties. A shallow water table limits basements on 19%.
100% of the county is in drought on the October 13, 2026 Drought Monitor map. FEMA's flood data list 1 flood losses here since 2016. 36% of homes were built before 1980, against 50% nationally; the median home dates from 1989.
Data as of October 13, 2026 · sources
expansive clay: shrink-swell limits slab homes
high water table: limits basements
in drought, October 13, 2026
of homes built before 1980
Soil under Bryan County
| Expansive clay (limits slab homes) | 41.6% |
| High water table (limits basements) | 18.8% |
| Septic fields very limited | 72.4% |
| Clay swell (LEP, by area) | 6.3% |
| High-swell land (LEP 6%+) | 52.8% |
| Mapped soil | 603,181 acres |
How we count · survey areas OK013 (2025-08-29)
What the numbers mean here
Clay swell averages a linear extensibility of 6.3% by land area here, and 53% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 42% of the mapped land.
Clay shrinks as it dries: 100% of the county is in drought on the latest map, and 42% of Bryan County's mapped land has shrink-swell clay.
On 19% of Bryan County's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
Rain over the 12 months to August 2026: 36.77 in, 6.75 in below the 1991-2020 average year of 43.52 in.
USDA rates 72% of the land very limited for septic absorption fields.
Drought
100% of the county is in drought (D1 or worse) on the October 13, 2026 map. Part of the county was in drought in 44 of the last 52 weeks; the most was 100% of its area, in 25 weeks, most recently on the October 13, 2026 map.
| Category, October 13, 2026 | Share of county |
|---|---|
| D0 abnormally dry or worse | 100% |
| D1 moderate drought or worse | 100% |
| D2 severe or worse | 100% |
| D3 extreme or worse | 78.1% |
| D4 exceptional | 0% |
Flood losses since 2016
1 flood losses since 2016, $27,589 paid. The worst year was 2025, with 1.
| Year | Flood losses |
|---|---|
| 2016 | 0 |
| 2017 | 0 |
| 2018 | 0 |
| 2019 | 0 |
| 2020 | 0 |
| 2021 | 0 |
| 2022 | 0 |
| 2023 | 0 |
| 2024 | 0 |
| 2025 | 1 |
| 2026 to date | 0 |
Rain
| Average year, 1991-2020 | 43.52 in |
| 12 months to August 2026 | 36.77 in (-6.75) |
| 2025 | 44.22 in (+0.70) |
| Wettest year since 1895 | 2015: 75.40 in |
| Driest year since 1895 | 1910: 19.14 in |
| Days with 1 inch or more, normal at DURANT (6 mi away) | 14.4 |
Homes
| Housing units | 20,780 |
| Median year built | 1989 |
| Built before 1980 | 36% |
| Built 2000 or later | 35% |
| Owner-occupied | 64% |
| Median value, owner-occupied | $174,900 |
| Single-family detached | 69% |
What repairs cost
Published ranges from cost guides, not quotes. More sources, and where they disagree.
Nearby counties
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Fannin County, TX | 27 mi | 66% | 23% |
| Marshall County, OK | 29 mi | 30% | 1% |
| Atoka County, OK | 32 mi | 45% | 36% |
| Johnston County, OK | 33 mi | 21% | 19% |
| Grayson County, TX | 33 mi | 60% | 4% |
| Choctaw County, OK | 41 mi | 47% | 36% |
| Coal County, OK | 43 mi | 54% | 71% |
| Lamar County, TX | 45 mi | 66% | 31% |
Sources: USDA SSURGO (August 29, 2025) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status