No reviews yet
Harding County, SD Contractor directory
Excavation contractors in Harding County, SD
1 verified excavating and site work contractor serving Harding County.
County excavation guide
Ground conditions and project requirements in Harding County
Use this local research to understand soil, seasonal constraints, permits, and jobsite logistics before choosing a contractor.
Skip to 1 contractorSoil Regime ProfileEPA Ecoregion 43, 44, 26 (Northern Glaciated Plains, Northwestern Glaciated Plains, Northwestern Great Plains)
South Dakota Glaciated Lowlands, Missouri Breaks & Black Hills Margin
Dominant Soil Order: Mollisols / Entisols / Aridisols / Vertisols
Parent Material: Glacial Till and Lake Sediments in the East; Pierre Shale Badlands and Ogallala Gravel in the West; Black Hills Crystalline Core
South Dakota splits at the Missouri River. The east is glacial: Coteau des Prairies till, prairie-pothole wetlands, and the Redwater-James lowlands, where hydric soils occupy 20-40 percent of the eastern counties, seasonal potholes and high water tables shape every drainage plan, and glacial clays bring modest shrink-swell (2-4 percent). Digging is easy; the recurring issues are wet trenches and frost at 42-48 inches. West of the river the landscape turns to Pierre Shale badlands and buttes: bentonitic shale soils with notorious slope-failure and shrink-swell behavior along the Missouri Breaks (the Pierre clay is the Midwest's worst landslide soil), Ogallala gravel and caliche on the tablelands, and the shallow bedrock of the Cheyenne and White River breaks. The Black Hills margin (Rapid City, Spearfish, Deadwood) adds crystalline core rock and the Red Valley shale swales: steep, rocky, and the only blasting country in the state. Slope is minimal in the east and moderate in the west.
Geographic Footprint:South Dakota's counties (Sioux Falls, Rapid City, Aberdeen, Pierre) split between wet glacial lowlands east of the Missouri and shale-badlands-plus-Black Hills rock west of it: pothole wetlands and 48-inch frost in the east, Pierre shale landslide country and Hills rock in the west.
Geotechnical Baseline
Physical Ground Conditions & Soil Properties
Shallow Bedrock (<50 in)
60.4%of county land area
High likelihood of bedrock refusal; hammer / ripper required for deep utilities.
High Shrink-Swell Clay
3.7%expansive soil
Low volumetric expansion risk in native subgrade.
Median Water Table Depth
51inches from surface
Deep water table; dry trenching conditions under normal weather.
Hydric / Wetland Soils
1.6%hydric coverage
Indicates poor natural drainage and potential jurisdictional wetland pockets.
Steep Terrain (Slope >15%)
19.4%of terrain
Predominantly gentle to rolling slopes suitable for wheeled earthmoving.
Septic Severe Limitations
87.7%severe rate
High rate of conventional drainfield limitations; engineered or drip systems often required.
Dominant Soil Textures:Fine sandy loamLoamLoamy fine sand
Surface Stones / Boulders: 14.0% coverage
Compliance & Permitting
Earthwork Regulations & Permit Thresholds
Stormwater & Erosion Control
SDR100000 Construction General Permit (DANR, effective Nov 1 2023 to Oct 31 2028); construction disturbing one or more acres or part of larger common plan; NOI at least 15 days before start
Administers NPDES stormwater discharge coverage for land-disturbing construction activities.
State Threshold:1.00 Acre
Local Threshold:Follows state
Onsite Wastewater & Utilities
Harding County Planning and Zoning
Jurisdiction over septic tank permits, soil evaluation perk tests, and drainfield sizing.
Housing on Septic:55.0%
Soil Evaluation:Percolation test per ARSD 74:53:01:30 (3 holes within 5 ft, plus one 4 ft deeper) before installation; not in disturbed or frozen soil
811 One-Call Requirements
South Dakota One Call (811)
Mandatory notice window: 48 hours prior to mechanized earthwork (excluding weekends and legal holidays).
Licensing & Clearing Permits
Weather & Ecology
Seasonal Constraints & Clearing Windows
Frozen Ground Days
90days / year
Typical days with sub-freezing soil conditions affecting digging.
Wet Season Months
May, June, July, August
Peak precipitation window requiring sediment traps and soil aeration.
Supply Chain & Hazards
Logistics, Aggregate Sources & Geohazards
Aggregate & Material Supply
Plant #31
Nearest active quarry: 66.5 miles haul distance.(0 active crushed stone/sand operations within 50 miles).
Flood & Hazard Overlay
FEMA 100-Yr Flood:0.0%(50% NFHL digital map coverage)
NWI Wetlands:0.0%jurisdictional coverage
Karst Terrain & Sinkhole Risk: Low
0.0% of county underlain by soluble carbonate rock formations.
HUC8 Primary Watersheds:South Fork Grand, South Fork Moreau, Upper Moreau, North Fork Grand, Upper Little Missouri, Boxelder
Public conservation land: 0.0% (USGS PAD-US).
Area-specific FAQ
Do I need to call before digging in Harding County?
Yes. You should contact South Dakota One Call at least 2 working days before any digging so underground lines can be marked.
How deep do footings need to be in South Dakota?
In South Dakota, footings typically need to extend below the frost line, which is around 60 inches here. A local contractor will confirm the code requirement for your site.
Verified local listings
Excavation contractors serving Harding County
1 verified listing