THE DIRTBID REGIONAL MODEL · ILLINOIS
Sitework in Illinois on the same Richmond Metro = 1.00 scale as the rest of DirtBid: 13 cost regions and 102 counties, each with a soil-risk rating from USDA and USGS data. Chicago Metro runs highest at 1.04×; Paducah Metro (Illinois side) lowest at 0.80×.
Illinois multipliers and county ratings are planning-level: built from federal price and soil data, and not yet checked against local bids or a local estimator.
Dominant ground: Ozaukee, Markham, Ashkum
9 counties in this region. 9 of 9 rate high for water table. 9 of 9 rate high for dewatering. Highest risk score: Grundy County (6 of 10).
Counties: Cook County, DeKalb County, DuPage County, Grundy County, Kane County, Kendall County, Lake County, McHenry County, Will County
Dominant ground: Bluford, Osco, Rozetta
65 counties in this region. 53 of 65 rate high for water table. 53 of 65 rate high for dewatering. USGS maps karst-prone rock across much of 3 of the 65. Highest risk score: Clark County (6 of 10).
Counties: Adams County, Brown County, Bureau County, Carroll County, Cass County, Christian County, Clark County, Clay County, Coles County, Crawford County, Cumberland County, De Witt County, Douglas County, Edgar County, Edwards County, Effingham County, Fayette County, Franklin County, Fulton County, Gallatin County, Greene County, Hamilton County, Hancock County, Hardin County, Henderson County, Iroquois County, Jackson County, Jasper County, Jefferson County, Jo Daviess County, Johnson County, Knox County, LaSalle County, Lawrence County, Lee County, Livingston County, Logan County, McDonough County, Marion County, Mason County, Montgomery County, Morgan County, Moultrie County, Ogle County, Perry County, Pike County, Pope County, Pulaski County, Putnam County, Randolph County, Richland County, Saline County, Schuyler County, Scott County, Shelby County, Stephenson County, Union County, Vermilion County, Wabash County, Warren County, Washington County, Wayne County, White County, Whiteside County, Williamson County
Dominant ground: Menfro, Hoyleton, Hickory
8 counties in this region. 6 of 8 rate high for water table. 6 of 8 rate high for dewatering. USGS maps karst-prone rock across much of 1 of the 8. Highest risk score: Bond County (5 of 10).
Counties: Bond County, Calhoun County, Clinton County, Jersey County, Macoupin County, Madison County, Monroe County, St. Clair County
Dominant ground: Osco, Ipava, Sable
5 counties in this region. 4 of 5 rate high for water table. 4 of 5 rate high for dewatering. Highest risk score: Marshall County (5 of 10).
Counties: Marshall County, Peoria County, Stark County, Tazewell County, Woodford County
Dominant ground: Drummer, Pecatonica, Flagg
2 counties in this region. 1 of 2 rate high for water table. 1 of 2 rate high for dewatering. Highest risk score: Boone County (5 of 10).
Counties: Boone County, Winnebago County
Dominant ground: Drummer, Flanagan, Elliott
3 counties in this region. 3 of 3 rate high for water table. 3 of 3 rate high for undercut. Highest risk score: Champaign County (5 of 10).
Counties: Champaign County, Ford County, Piatt County
Dominant ground: Ipava, Sable, Broadwell
2 counties in this region. 2 of 2 rate high for water table. 2 of 2 rate high for dewatering. Highest risk score: Menard County (5 of 10).
Counties: Menard County, Sangamon County
Dominant ground: Osco, Sylvan, Hickory
3 counties in this region. 3 of 3 rate high for water table. 2 of 3 rate high for dewatering. Highest risk score: Henry County (5 of 10).
Counties: Henry County, Mercer County, Rock Island County
Dominant ground: Sable, Catlin, Ipava
1 county in this region. 1 of 1 rate high for water table. 1 of 1 rate high for dewatering. Highest risk score: McLean County (4 of 10).
Counties: McLean County
Dominant ground: Reddick, Andres, Gilford
1 county in this region. 1 of 1 rate high for water table. 1 of 1 rate high for dewatering. Highest risk score: Kankakee County (5 of 10).
Counties: Kankakee County
Dominant ground: Flanagan, Drummer, Sable
1 county in this region. 1 of 1 rate high for water table. 1 of 1 rate high for undercut. Highest risk score: Macon County (5 of 10).
Counties: Macon County
Dominant ground: Hosmer, Belknap, Alford
1 county in this region. 1 of 1 rate high for water table. 1 of 1 rate high for dewatering. Highest risk score: Massac County (5 of 10). This multiplier sits outside the range the model was tested on, so treat it as rougher.
Counties: Massac County
Dominant ground: Stookey, Darwin, Menfro
1 county in this region. 1 of 1 rate high for water table. 1 of 1 rate high for undercut. Highest risk score: Alexander County (5 of 10). This multiplier sits outside the range the model was tested on, so treat it as rougher.
Counties: Alexander County
FAQ
From USDA soil survey data, the most common across the state: water table (86 of 102 counties rate high), dewatering (85 of 102 counties rate high), undercut (15 of 102 counties rate high). A parcel can differ from its county, so read the survey for your exact site.
From the Commerce Department's Regional Price Parities, on the same Richmond Metro = 1.00 scale as Virginia. Across 29 reviewed regions that method missed by about 0.03 on average. They have not been checked against executed bids in Illinois, so use them for planning, not a final bid.
They are screening ratings from federal soil and geology data, not a local estimator's review and not a geotechnical report. Tested against 511 reviewed counties, they land within one level most of the time, and exact matches are less common. Get borings before you price a real site.
Soil Report
A $350 DirtBid AI Soil Report reads the official USDA survey for your exact parcel, flags the hazards above, and prices the risk — before you buy land or sign a contract.