Excavation contractor jobsite in St. Louis County, MN

St. Louis County, MN Contractor directory

Excavation contractors in St. Louis County, MN

31 verified excavating and site work contractors serving St. Louis County.

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County excavation guide

Ground conditions and project requirements in St. Louis County

Use this local research to understand soil, seasonal constraints, permits, and jobsite logistics before choosing a contractor.

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Soil Regime ProfileEPA Ecoregion 50, 49, 46 (Northern Lakes and Forests, Northern Minnesota Wetlands, Northern Glaciated Plains)

Minnesota Northwoods Sand Plains, Bogs & Canadian Shield Margin

Dominant Soil Order: Spodosols / Entisols / Histosols / Inceptisols
Parent Material: Glacial Outwash Sand, Lacustrine Silt, Peat and Muck over Glacial Drift and Precambrian Bedrock

Northern Minnesota is the wet end of the state: outwash sand plains, extensive peat bogs, and the granite-greenstone Canadian Shield bedrock of the Arrowhead. Ground conditions split three ways. Sand-plain counties cut fast in loamy sand but stand poorly, so trench boxes are standard. Bog and wetland counties (Clearwater, Beltrami, Lake of the Woods, Koochiching) carry hydric soils on 40-70 percent of land, muck excavation and peat removal are ordinary site work, and water tables run within inches of grade. The Arrowhead counties (St. Louis, Lake, Cook) add the state's only shallow bedrock: Precambrian greenstone, basalt and the Duluth Complex lie within 50 inches on 20-60 percent of land, so rock excavation and blasting appear in most utility bids, with frost reaching the deepest design values in the contiguous states. Shrink-swell is negligible everywhere. The compressed building season concentrates excavation between May and October.

Geographic Footprint:Minnesota's northern tier (the Arrowhead, the sand plains north of Brainerd, and the Red Lake bog country) is sand, peat and Precambrian rock: fast-cutting sands, heavy muck work, and the state's only blasting. The season runs May through October.
Geotechnical Baseline

Physical Ground Conditions & Soil Properties

Shallow Bedrock (<50 in)
41.1%of county land area

High likelihood of bedrock refusal; hammer / ripper required for deep utilities.

High Shrink-Swell Clay
2.0%expansive soil

Low volumetric expansion risk in native subgrade.

Median Water Table Depth
12inches from surface

Shallow water table; active dewatering or sumps needed for deep trenching.

Hydric / Wetland Soils
33.1%hydric coverage

Indicates poor natural drainage and potential jurisdictional wetland pockets.

Steep Terrain (Slope >15%)
12.9%of terrain

Predominantly gentle to rolling slopes suitable for wheeled earthmoving.

Septic Severe Limitations
94.8%severe rate

High rate of conventional drainfield limitations; engineered or drip systems often required.

Dominant Soil Textures:LoamSilt loamFine sandy loam
Surface Stones / Boulders: 66.5% coverage
Compliance & Permitting

Earthwork Regulations & Permit Thresholds

Stormwater & Erosion Control
MPCA NPDES/SDS Construction Stormwater General Permit MNR100001, effective Aug 1 2023 to Jul 31 2028; construction disturbing one acre or more, or less than one acre if part of a larger common plan of development or sale of one acre or more. Online application, coverage begins one business day after complete application.

Administers NPDES stormwater discharge coverage for land-disturbing construction activities.

State Threshold:1.00 Acre
Local Threshold:Follows state
Onsite Wastewater & Utilities
St. Louis County Environmental Services (SSTS Program)

Jurisdiction over septic tank permits, soil evaluation perk tests, and drainfield sizing.

Housing on Septic:55.0%
Soil Evaluation:Site evaluation report per Minn. R. 7080.1730; soil observations in exposed pit, hand auger or probe; licensed SSTS designer or soil evaluator
811 One-Call Requirements
Gopher State One Call (Minnesota 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
120days / year

Typical days with sub-freezing soil conditions affecting digging.

Wet Season Months
May, June, July, August, September

Peak precipitation window requiring sediment traps and soil aeration.

Supply Chain & Hazards

Logistics, Aggregate Sources & Geohazards

Aggregate & Material Supply
Coons Pit

Nearest active quarry: 10.6 miles haul distance.(6 active crushed stone/sand operations within 50 miles).

Flood & Hazard Overlay
FEMA 100-Yr Flood:6.0%(100% NFHL digital map coverage)
NWI Wetlands:78.8%jurisdictional coverage
Karst Terrain & Sinkhole Risk: Low

0.0% of county underlain by soluble carbonate rock formations.

HUC8 Primary Watersheds:St. Louis, Beartrap-Nemadji, Rainy Headwaters, Prairie-Willow, Little Fork, Cloquet
Public conservation land: 1.8% (USGS PAD-US).

Area-specific FAQ

Do I need to call before digging in St. Louis County?

Yes. You should contact Gopher State One Call at least 2 working days before any digging so underground lines can be marked.

How deep do footings need to be in Minnesota?

In Minnesota, footings typically need to extend below the frost line, which is around 100 inches here. A local contractor will confirm the code requirement for your site.

Verified local listings

Excavation contractors serving St. Louis County

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