1. Locally owned and operated in Castle Rock, WA

2. Licensed (LIC #COLUMGI828N1) and insured excavation specialists

3. Experienced operators trained in safe, compliant earthwork

4. Fully maintained fleet and equipment tailored for Washington terrain and soil types

5. Responsive, transparent project estimates and scheduling

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.

We also understand local permitting requirements, drainage challenges, and how seasonal moisture can impact timelines and ground stability. That means fewer delays, better planning, and a smoother project from start to finish. When you work with us, you are getting more than equipment, you are getting local expertise that protects your investment.

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

1. Site Preparation & Grading – Precision excavation for driveways, foundations, and building pads.

2. Utility Trenching & Installation Support – Efficient trenching for water, sewer, power, and drainage systems.

3. Land Clearing & Tree/Stump Removal – Clearing and site cleanup for new construction or expansions.

4. Pit Excavation & Retaining Walls – Structural digging and backfill work.

5. 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

Ready to break ground? Call (360) 957-8847