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Bothell Boulder Retaining Wall

A rugged wall of large stacked boulders that stabilizes steep PNW slopes with a bold, naturalistic look and excellent drainage.

Bothell Boulder Retaining Wall

Boulder retaining walls use large quarried rocks placed by machine to hold back steep grades common on Western Washington hillside lots. The generous gaps between boulders allow groundwater to seep through freely, which is a major advantage in our rain-heavy region, though we still add gravel backfill and drainage behind the wall on taller installations. Each boulder is nested and keyed into the one below so the wall resists sliding even in saturated soil. The finished wall reads as a natural rock outcropping and needs almost no maintenance.

Local Service Information

Bothell

A city straddling the King and Snohomish county line at the north end of Lake Washington along the Sammamish River.

County: King County / Snohomish County
ZIP Codes Served: 98011, 98012, 98021
Neighborhoods: Downtown, Canyon Park, North Creek
Nearby Communities: Kenmore, Woodinville, Kirkland, Mill Creek
Common Property Types: Predominantly single-family homes with townhomes and some condominiums and multifamily housing; commercial property includes retail, office, and small mixed-use buildings.
Local Tree & Landscape Notes: Common regional trees include Douglas fir, western red cedar, western hemlock, bigleaf maple, and red alder, alongside many ornamental species. Wet soils and dense canopy are common considerations for access and scheduling.
Permit Considerations: Permit requirements vary depending on tree size, species, protected areas, shoreline regulations, critical areas, and local municipal code. Always verify current requirements with the local jurisdiction before beginning work.
Climate: Marine west coast climate typical of the Puget Sound region: mild, wet winters and warm, relatively dry summers, with most rainfall from fall through spring. Occasional wind, snow, and ice events and seasonal soil saturation influence tree health and the timing of tree work.

Bothell straddles the King and Snohomish county line along the Sammamish River, mixing a revitalized downtown with wooded residential neighborhoods and business parks like Canyon Park. Landscaping here ranges from riverside settings near Bothell Landing to hillside homes and newer townhome communities. Residents often want green, walkable yards that fit the city’s trail-connected, community feel.

Landscaping in Bothell often works with wooded lots, gentle slopes, and proximity to the Sammamish River corridor. Services commonly include lawn care, garden beds, and plantings suited to shaded or damp areas, along with tidy grounds for the townhome and mixed-use developments spreading through the city.

Site Conditions: Typical of a zone 8b lowland climate, Bothell soils near the Sammamish River can be moist and low-lying, while wooded hillside lots drain more freely. Tree cover creates plenty of shade, sun exposure varies by slope, and drainage is a common consideration near the river valley.
Seasonal Considerations: Bothell’s spring brings fast growth and a busy round of pruning, mulching, and bed cleanup, while summer calls for steady watering, especially on sunnier slopes. Fall is the time for aeration, overseeding, and heavy leaf management under the trees, and winter suits dormant pruning and drainage upkeep.
Common Project Types: Common Bothell projects include shade and rain-garden plantings, lawn renovation, patios and paths, and tidy landscapes for townhome grounds. Hillside lots may need light terracing, while riverside properties focus on moisture-tolerant beds.
Property Styles: Bothell properties range from wooded single-family lots to newer townhomes and condominiums near downtown and Canyon Park. Trees, slope, and nearness to the river valley shape many yards, encouraging shade- and moisture-aware designs.
Local Materials & Plants: Moisture- and shade-tolerant natives like red-twig dogwood, sword fern, and salal suit Bothell’s setting, along with hydrangeas and other adaptable perennials. Bark mulch, permeable pavers, and natural stone work well for damp, wooded lots near the Sammamish corridor.
Planning Your Project: For Bothell properties, planting and grading are best timed for drier months, with rain-garden and drainage solutions planned for the wetter, low-lying areas. Near the river corridor, confirming general drainage and buffer considerations early helps larger projects stay on track.

From riverside gardens near Bothell Landing to townhome grounds in Canyon Park, reach out to plan landscaping shaped for your Bothell lot and its wooded, trail-connected setting.

Benefits

Excellent free-draining performance in wet climates; Handles steep slopes and heavy loads; Bold, natural rock-outcrop appearance; Minimal long-term maintenance; Very long lifespan with no mortar to fail

Process

1) Excavate and bench the slope; 2) Compact a stable gravel base trench; 3) Set and key the largest base boulders; 4) Stack upper boulders while adding gravel backfill and drainage; 5) Blend the top boulders into finished grade and plantings

Ready to get started?

Contact us for a free boulder wall assessment of your slope.
Call: 206-593-3336