Logan County, Ohio
A shallow water table limits basements on 81% of Logan County's mapped land, a higher share than 89% of US counties. Shrink-swell clay limits houses without basements on 26%.
None of the county is in drought on the October 13, 2026 Drought Monitor map. FEMA's flood data list 12 flood losses here since 2016. 58% of homes were built before 1980, against 50% nationally; the median home dates from 1973.
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 Logan County
| Expansive clay (limits slab homes) | 25.9% |
| High water table (limits basements) | 80.8% |
| Septic fields very limited | 96.6% |
| Clay swell (LEP, by area) | 5.1% |
| High-swell land (LEP 6%+) | 19.5% |
| Mapped soil | 298,636 acres |
How we count · survey areas OH091 (2025-09-02)
What the numbers mean here
Clay swell averages a linear extensibility of 5.1% by land area here, and 20% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 26% of the mapped land.
On 81% of Logan 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: 43.05 in, 1.84 in above the 1991-2020 average year of 41.21 in.
USDA rates 97% of the land very limited for septic absorption fields.
Drought
0% of the county is in drought (D1 or worse) on the October 13, 2026 map. Part of the county was in drought in 3 of the last 52 weeks; the most was 100% of its area, on the October 21, 2025 map.
| Category, October 13, 2026 | Share of county |
|---|---|
| D0 abnormally dry or worse | 0% |
| D1 moderate drought or worse | 0% |
| D2 severe or worse | 0% |
| D3 extreme or worse | 0% |
| D4 exceptional | 0% |
Flood losses since 2016
12 flood losses since 2016, $213,791 paid. The worst year was 2019, with 7.
| Year | Flood losses |
|---|---|
| 2016 | 0 |
| 2017 | 0 |
| 2018 | 2 |
| 2019 | 7 |
| 2020 | 0 |
| 2021 | 0 |
| 2022 | 0 |
| 2023 | 0 |
| 2024 | 0 |
| 2025 | 1 |
| 2026 to date | 2 |
Rain
| Average year, 1991-2020 | 41.21 in |
| 12 months to August 2026 | 43.05 in (+1.84) |
| 2025 | 36.97 in (-4.24) |
| Wettest year since 1895 | 2011: 58.52 in |
| Driest year since 1895 | 1934: 22.57 in |
| Days with 1 inch or more, normal at BELLEFONTAINE (2 mi away) | 9.4 |
Homes
| Housing units | 23,866 |
| Median year built | 1973 |
| Built before 1980 | 58% |
| Built 2000 or later | 18% |
| Owner-occupied | 78% |
| Median value, owner-occupied | $203,200 |
| Single-family detached | 74% |
What repairs cost
Published ranges from cost guides, not quotes. More sources, and where they disagree.
Cities in Logan County
| City | Expansive clay | High water table | Homes |
|---|---|---|---|
| Belle Center | 38% | 67% | 298 |
| Bellefontaine | 7% | 60% | 6,767 |
| De Graff | 5% | 55% | 726 |
| Huntsville | 45% | 83% | 195 |
| Lakeview | 82% | 90% | 706 |
| Quincy | 7% | 82% | 250 |
| Ridgeway | 49% | 97% | 125 |
| Rushsylvania | 83% | 96% | 201 |
| Russells Point | 67% | 79% | 1,118 |
| Valley Hi | 1% | 23% | 91 |
| West Liberty | 26% | 44% | 754 |
| West Mansfield | 7% | 96% | 357 |
| Zanesfield | 23% | 21% | 87 |
Nearby counties
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Champaign County, OH | 17 mi | 13% | 83% |
| Hardin County, OH | 20 mi | 35% | 97% |
| Union County, OH | 22 mi | 25% | 97% |
| Shelby County, OH | 23 mi | 24% | 94% |
| Auglaize County, OH | 27 mi | 29% | 94% |
| Allen County, OH | 32 mi | 31% | 93% |
| Clark County, OH | 32 mi | 17% | 59% |
| Miami County, OH | 34 mi | 18% | 81% |
Sources: USDA SSURGO (September 2, 2025) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status