THE DIRTBID REGIONAL MODEL · IDAHO
Sitework in Idaho on the same Richmond Metro = 1.00 scale as the rest of DirtBid: 8 cost regions and 44 counties, each with a soil-risk rating from USDA and USGS data. Boise City Metro runs highest at 0.97×; Pocatello Metro lowest at 0.84×.
Idaho 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: Purdam, Power, Chilcott
5 counties in this region. 3 of 5 rate high for shallow rock. Highest risk score: Owyhee County (5 of 10).
Counties: Ada County, Boise County, Canyon County, Gem County, Owyhee County
Dominant ground: Rexburg, Andic Haplocryepts, Povey
30 counties in this region. 14 of 30 rate high for shallow rock. USGS maps karst-prone rock across much of 1 of the 30. Deep frost protection is likely in 9 of 30. Highest risk score: Oneida County (6 of 10).
Counties: Adams County, Bear Lake County, Benewah County, Bingham County, Blaine County, Bonner County, Boundary County, Camas County, Caribou County, Cassia County, Clark County, Clearwater County, Custer County, Elmore County, Fremont County, Gooding County, Idaho County, Latah County, Lemhi County, Lewis County, Lincoln County, Madison County, Minidoka County, Oneida County, Payette County, Power County, Shoshone County, Teton County, Valley County, Washington County
Dominant ground: Bouldercreek, Hugus, Vassar
1 county in this region. Deep frost protection is likely in 1 of 1. Highest risk score: Kootenai County (5 of 10).
Counties: Kootenai County
Dominant ground: Pancheri, Ririe, Edgway
3 counties in this region. 2 of 3 rate high for shallow rock. Highest risk score: Bonneville County (4 of 10).
Counties: Bonneville County, Butte County, Jefferson County
Dominant ground: Portneuf, Sluka, Power
2 counties in this region. 1 of 2 rate high for shallow rock. Highest risk score: Jerome County (4 of 10).
Counties: Jerome County, Twin Falls County
Dominant ground: Rexburg, Neeley, Pocatello
1 county in this region. 1 of 1 rate high for shallow rock. Highest risk score: Bannock County (4 of 10).
Counties: Bannock County
Dominant ground: Kettenbach, Klickson, Naff
1 county in this region. 1 of 1 rate high for shallow rock. Highest risk score: Nez Perce County (4 of 10).
Counties: Nez Perce County
Dominant ground: Manila, Oxford, Parleys
1 county in this region. Highest risk score: Franklin County (4 of 10).
Counties: Franklin County
FAQ
From USDA soil survey data, the most common across the state: shallow rock (22 of 44 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 Idaho, 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.