Why Homeowners & Contractors Prefer Us in SW Washington
Locally owned and operated in Castle Rock, WA
Licensed (LIC #COLUMGI828N1) and insured excavation specialists
Experienced operators trained in safe, compliant earthwork
Fully maintained fleet and equipment tailored for Washington terrain and soil types
Responsive, transparent project estimates and scheduling
Local Roots & Trusted Reputation
With deep ties to Southwest Washington, we understand local soils—from volcanic silt loam to alluvial deposits—and weather impacts on excavation. Whether prepping for a pole barn near the Coweeman River or trenching for utilities in downtown Longview, our knowledge ensures the job is done right—and stays done.
Excavating Contractor in Castle Rock, WA
At Columbia Groundwork Inc., based in Castle Rock, Washington, we deliver expert excavation services for residential, commercial, and industrial needs across Cowlitz, Lewis, and Clark Counties.
Services We Offer
Site Preparation & Grading – Precision excavation for driveways, foundations, and building pads.
Utility Trenching & Installation Support – Efficient trenching for water, sewer, power, and drainage systems.
Land Clearing & Tree/Stump Removal – Clearing and site cleanup for new construction or expansions.
Pit Excavation & Retaining Walls – Structural digging and backfill work.
Hauling & Disposal Coordination – We manage materials removal and disposal through our in-house trucking fleet.
Areas We Serve
We’re proud to support communities across:
Castle Rock
Longview & Kelso
Woodland & Kalama
Chehalis & Centralia
And all of Cowlitz, Lewis, and Clark Counties
Request Your Excavation Estimate
Ready to break ground? Call (360) 957-8847
