Soil series profile
Dennis soil series
Dennis is a somewhat poorly drained soil with a silt loam surface, mapped on 1,675,074 acres in 62 counties across 4 states. Hydrologic group C/D.
- Drainage class
- Somewhat poorly drained 100% of mapped acres
- Hydrologic group
- C/D 97% of mapped acres
- Typical topsoil pH
- 5.6 moderately acidic · range 5.6–5.6
- Mapped area
- 1.7M acres in 62 counties, 4 states
Typical Dennis profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–11 in (A) | Silt loam | 5.6 | 19% | 23% | 2.5% |
| 11–17 in (BA) | Silty clay loam | 5.6 | 31% | 19% | 1.2% |
| 17–22 in (Bt1) | Silty clay | 6.8 | 44% | 15% | 0.7% |
| 22–68 in (Bt2) | Silty clay | 6.8 | 44% | 15% | 0.5% |
| 68–79 in (C) | Silty clay loam | 6.8 | 36% | 18% | 0.5% |
What this means
What Dennis soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Dennis soils is moderately acidic: pH 5.6. Many vegetables grow well here, and some gardens benefit from a little lime. Test before adding any.
Loamy topsoil (loam, silt loam and similar) covers 100% of mapped Dennis acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is silt loam (84% of mapped Dennis acres).
100% of mapped Dennis acres is somewhat poorly to very poorly drained, so soil stays soggy for long spells after rain and in wet seasons. Raised beds, plants that tolerate wet feet, and not working the soil while wet all help.
For lawns and yards
On 100% of mapped acres, rain soaks in slowly (hydrologic groups C and D, including dual groups that are D until drained). Expect runoff and puddles after heavy rain: core-aerate compacted lawns and keep ground sloping away from foundations.
For a septic system
For conventional septic absorption fields, NRCS rates 100% of the acres in mapped Dennis soils very limited, 0% somewhat limited and 0% not limited.
Where the soil is very limited (slow permeability, a high water table, flooding, shallow bedrock or steep slopes), alternative systems such as mound or sand-filter designs are common and cost more.
Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.
Where Dennis soil is found
Mapped acres
Dennis is mapped in Oklahoma, Kansas, Missouri and Arkansas. The 60 counties with the most Dennis acres:
| County | Acres | Share of county land |
|---|---|---|
| Craig County, OK | 102,315 | 21.0% |
| Muskogee County, OK | 92,404 | 17.9% |
| Cherokee County, KS | 84,389 | 22.6% |
| Tulsa County, OK | 77,256 | 21.3% |
| Rogers County, OK | 72,140 | 16.8% |
| Wagoner County, OK | 67,630 | 19.0% |
| Hughes County, OK | 67,018 | 13.1% |
| Okmulgee County, OK | 62,055 | 14.0% |
| Pittsburg County, OK | 59,900 | 7.1% |
| Mayes County, OK | 51,226 | 12.3% |
| Bourbon County, KS | 51,198 | 12.6% |
| Woodson County, KS | 48,197 | 15.1% |
| Montgomery County, KS | 47,364 | 11.5% |
| Bryan County, OK | 46,337 | 8.0% |
| Crawford County, KS | 45,883 | 12.1% |
| Washington County, OK | 45,607 | 17.3% |
| Nowata County, OK | 44,716 | 12.4% |
| Labette County, KS | 41,676 | 10.1% |
| Ottawa County, OK | 40,770 | 13.6% |
| Chautauqua County, KS | 39,053 | 9.5% |
| McIntosh County, OK | 38,445 | 9.8% |
| Neosho County, KS | 36,869 | 10.1% |
| Coal County, OK | 36,793 | 11.1% |
| Osage County, KS | 34,857 | 7.8% |
| Greenwood County, KS | 29,728 | 4.1% |
| Franklin County, KS | 29,414 | 8.0% |
| Creek County, OK | 29,175 | 4.8% |
| Allen County, KS | 28,311 | 8.8% |
| Wilson County, KS | 26,813 | 7.3% |
| Coffey County, KS | 25,422 | 6.3% |
| Atoka County, OK | 23,271 | 3.7% |
| Linn County, KS | 23,261 | 6.1% |
| Elk County, KS | 23,093 | 5.6% |
| Okfuskee County, OK | 21,646 | 5.5% |
| Miami County, KS | 16,521 | 4.4% |
| Pontotoc County, OK | 13,879 | 3.0% |
| Anderson County, KS | 9,147 | 2.5% |
| Delaware County, OK | 8,828 | 1.9% |
| Barton County, MO | 7,058 | 1.9% |
| Osage County, OK | 5,812 | 0.4% |
| Vernon County, MO | 5,247 | 1.0% |
| Johnston County, OK | 4,144 | 1.0% |
| Seminole County, OK | 3,699 | 0.9% |
| Cherokee County, OK | 1,525 | 0.3% |
| Bates County, MO | 1,027 | 0.2% |
| Lyon County, KS | 933 | 0.2% |
| Dade County, MO | 724 | 0.2% |
| Douglas County, KS | 595 | 0.2% |
| Jasper County, MO | 427 | 0.1% |
| Lawrence County, MO | 420 | 0.1% |
| Johnson County, KS | 309 | 0.1% |
| Greene County, MO | 172 | 0.0% |
| Benton County, AR | 86 | 0.0% |
| Newton County, MO | 82 | 0.0% |
| Cedar County, MO | 56 | 0.0% |
| Wabaunsee County, KS | 55 | 0.0% |
| Barry County, MO | 51 | 0.0% |
| Pawnee County, OK | 30 | 0.0% |
| Adair County, OK | 8 | 0.0% |
| St. Clair County, MO | 4 | 0.0% |
Septic absorption fields
NRCS rating, share of Dennis acres
Show as a table
| Category | Share of acres |
|---|---|
| Not limited | 0.0% |
| Somewhat limited | 0.0% |
| Very limited | 100.0% |
Drainage, water table and flooding
Share of Dennis acres
- Depth to seasonal high water table
- About 1.7 feet (20 in) (median where reported); within 18 inches on 15% of acres.
- Flooding
- Not mapped as flooding on most acres.
- Slope
- Typically 2–4% (median 2%).
- Topsoil organic matter
- Median 2.5%.
Drainage class
Show as a table
| Category | Share of acres |
|---|---|
| Excessively drained | 0.0% |
| Somewhat excessively drained | 0.0% |
| Well drained | 0.0% |
| Moderately well drained | 0.0% |
| Somewhat poorly drained | 100.0% |
| Poorly drained | 0.0% |
| Very poorly drained | 0.0% |
Hydrologic soil group
Show as a table
| Category | Share of acres |
|---|---|
| A: fast infiltration (mostly sandy or gravelly) | 0.0% |
| B: moderate infiltration | 0.0% |
| C: slow infiltration | 3.1% |
| D: very slow infiltration (clayey, shallow or wet) | 0.1% |
| A/D: D as is, A if drained | 0.0% |
| B/D: D as is, B if drained | 0.0% |
| C/D: D as is, C if drained | 96.8% |
Sources & data dates
- Source
- USDA NRCS Soil Survey Geographic Database (SSURGO), queried through Soil Data Access. Public domain.
- Data date
- SSURGO as published on November 3, 2026 (most recent survey area update October 26, 2026). NRCS refreshes SSURGO each October.
- Scope
- All map unit components named Dennis (component kind "Series") in SSURGO: 1,675,074 acres.
- Method
- Shares are by mapped acres of Dennis components. The profile comes from the single largest Dennis component. Full methodology.