HomeSoil seriesIpava
Ipava soil series
Ipava soils cover 1,126,136 mapped acres, almost all of them in Illinois. USDA rates shrink-swell a limit for houses without basements on over 99% of that land, and a shallow water table a limit for basements on 100%.
It is the leading soil series by area in 7 of the counties and cities on this site, including Sangamon County, IL; McDonough County, IL; Morgan County, IL.
SSURGO survey versions to August 5, 2026 · series description revised 2015-04
of its land: shrink-swell limits houses without basements
of its land: a shallow water table limits basements
median highest linear extensibility (6% and up is high)
median highest clay content in the top 150 cm
USDA's description
The Ipava series consists of very deep, somewhat poorly drained soils formed in loess on uplands. Slope ranges from 0 to 5 percent. Mean annual temperature is about 11.7 degrees C (53 degrees F), and mean annual precipitation is about 965 mm (38 inches).
Source: USDA NRCS series description (OSD) for Ipava, revised 2015-04. Read it.
Engineering properties
| Mapped area (SSURGO) | 1,126,136 acres |
| Shrink-swell limits houses without basements | 99.9% |
| Shallow water table limits basements | 100.0% |
| Very limited for septic absorption fields | 100.0% |
| Most common drainage class | Somewhat poorly drained |
| Most common hydrologic soil group | C/D |
| Taxonomic class | Fine, smectitic, mesic Aquic Argiudolls |
| Type location | Knox County, Illinois |
Where Ipava is mapped
| State | Mapped acres |
|---|---|
| Illinois | 1,119,580 |
| Indiana | 5,559 |
| Wisconsin | 997 |
Places where Ipava leads
Counties and cities where Ipava covers more mapped land than any other series.
| Place | Share of mapped land |
|---|---|
| Sangamon County, IL | 25% |
| McDonough County, IL | 24% |
| Morgan County, IL | 19% |
| Hancock County, IL | 13% |
| Tazewell County, IL | 13% |
| Menard County, IL | 10% |
| Cass County, IL | 7% |
Other places where Ipava is a main soil
Counties and cities where Ipava is among the six soil series covering the most mapped land, but not the first. Share of the place's mapped land.
Counties
- Logan County, IL 18%
- Knox County, IL 15%
- De Witt County, IL 15%
- Stark County, IL 12%
- Christian County, IL 12%
- Peoria County, IL 10%
- McLean County, IL 10%
- Woodford County, IL 10%
- Piatt County, IL 9%
- Fulton County, IL 7%
- Macon County, IL 7%
- Scott County, IL 6%
- Schuyler County, IL 6%
- Macoupin County, IL 5%
- Henry County, IL 5%
- Warren County, IL 5%
Sources
Shares and properties: USDA NRCS SSURGO via Soil Data Access, weighted by each component's share of its map units. Description: the USDA NRCS series description. How we count.