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In downtown St. Helens, OR, Wallace Construction recently completed a retaining wall addition designed to support a new ADA-accessible ramp at the historic Columbia County Courthouse.
This project reflects a growing need in Columbia County for public infrastructure that prioritizes accessibility while maintaining architectural integrity—especially in older buildings like the courthouse, which is known for its iconic dark basalt stone exterior and its location along the scenic Columbia River waterfront.
Improving Accessibility with Structural Support
The Columbia County Courthouse, a centerpiece of local government and civic activity, needed to upgrade its entrance to meet ADA standards. The site’s natural slope and existing landscape posed challenges in creating a compliant, gradual path without extensive excavation or disruption to the historic façade.
That’s where retaining walls became essential.
Wallace Construction was brought in to install a series of new concrete retaining walls that would allow for the elevation changes required in a properly sloped ADA ramp.
The Retaining Wall Installation Process
To provide long-term stability and meet accessibility codes, the project followed a step-by-step process typical of retaining wall builds but tailored to the courthouse’s specific layout and load-bearing needs:
Site Preparation & Excavation
The team began by excavating the existing soil and debris in front of the building, taking care to protect nearby walkways and entrances. Temporary plywood walkways were installed to allow safe foot traffic during the work.
Footing and Base Installation
A reinforced concrete footing was poured to create a stable foundation for the retaining walls. Proper drainage considerations were built into the base to prevent water accumulation—a crucial detail in the rainy Pacific Northwest.
Forming and Pouring the Concrete Walls
Using high-strength concrete, the retaining walls were formed and poured in place, with careful alignment to match the existing building lines. Vertical forms were designed to accommodate future ramp railings and transitions.
Curing and Surface Finishing
After pouring, the concrete was left to cure and then cleaned and edged for a sharp, finished appearance. The resulting structure is not just functional—it complements the historic look of the courthouse while supporting modern accessibility upgrades.
Functional Design Meets Local Heritage
The addition of a durable, ADA-compliant ramp supported by retaining walls improves safety and convenience for residents attending court, registering property, or participating in civic events.
The retaining wall structures will hold up against St. Helens’ rainy winters and the occasional snowfall, minimizing erosion and protecting the ramp structure from shifting or cracking over time.
Upgrade Access with Professional Retaining Wall Construction
Creating safe, code-compliant access on a sloped site takes more than just pouring concrete—it takes thoughtful planning and precision.
If you’re upgrading public infrastructure or looking to add structural support for walkways, ramps, ADA landing, or landscaping features, retaining walls are a smart solution.
At Wallace Construction, we specialize in concrete and retaining wall installations that blend strength, safety, and visual appeal. Whether you’re managing a public works project in Columbia County or upgrading a commercial site in St. Helens or nearby towns like Scappoose and Rainier, we’re here to help.
Contact us today to schedule a consultation and see how our retaining wall services can support your next project.
