Aggregate Products & Gravel in King County, Washington

Driveway and Road Materials

Choosing the right aggregates for driveways and road bases in King County matters because of rain intensity, steep slopes, and clay pockets. We offer materials that compact well and shed water.

Driveway base and surface options

• Road Base - Engineered for load bearing and long term performance.
• Crusher Run - Great for a firm, compactable base under pavers and gravel surfaces.
• Driveway Gravel - Surface blends for traction and appearance.
• 3/4 inch Crushed Stone - Common base stone for durable compaction.

Best practices for King County driveways

• Start with proper subgrade and geotextile where soils are soft or peat is present.
• Use layered aggregates: road base, crusher run, then a surface stone like driveway gravel.
• Grade for runoff toward appropriate channels or storm systems to protect slopes.

Drainage, Erosion Control, and Specialty Aggregates

King County's rainfall, steep ravines, and glacial soils make drainage design essential. We supply aggregates that reduce erosion and improve subsurface flow.

Drainage materials

• Drain Rock - Large stone for French drains and underdrains
• #57 Stone - Common in perforated drain lines and gabion backs
• Crushed Concrete - A recycled option for subsurface drainage with strong compaction

Erosion control and slope stabilization

• Use river rock or larger rounded stones in channels to slow water velocity.
• Combine geotextile fabric with crushed stone on steep slopes to prevent washout.
• Local plantings and native vegetation work with aggregates to secure soil on banks.

Soils, Sand, and Planting Materials

Healthy landscapes depend on correct soils and sands. In King County we supply topsoil and sand products for lawns, gardens, and play areas.

Soils for planting and grading

• Topsoil - Screened and blended topsoil for planting and lawn restoration
• Fill Dirt - Clean fill for grading and raising low areas

Sand types and uses

• Mason Sand - For mortar and bedding pavers
• Washed Sand - Clean base layers and concrete mixes
• Playground Sand - Safe fill for play areas

Decorative Rock, Paths, and Play Areas

For yards and parks across King County, decorative stone adds function and curb appeal. We offer options for paths, dry streambeds, and playgrounds.

Decorative options

• River Rock - Smooth, rounded stones for accents and water features
• Pea Gravel - Comfortable walking surfaces and kid friendly play surfaces
• Decomposed Granite - Natural, compactable path material used in parks and native plantings

Walkways and patios

• Walkway Gravel - Designed to compact for a stable walking surface
• Pair with edging and proper base stone to prevent migration and maintain clean lines.

Material Comparison

Service Features and Delivery in King County

We provide dependable aggregate delivery across the county with site-aware drivers and attention to local conditions. Our delivery teams understand King County access limitations and seasonal road restrictions.

What you can expect

• Free delivery within most of King County including Seattle, Bellevue, and Renton.
• Tailored drop locations and offload options for tight urban lots and rural driveways.
• Material delivered by truck or small equipment depending on site access.
• Seasonal scheduling that accounts for local wet weather and permit windows.

Project types we commonly support

• Residential driveways and turnaround pads
• Commercial site preparation and road base
• Stormwater and French drain installs
• Garden renovation, topsoil delivery, and lawn repair
• Public parks, playgrounds, and trail surfaces

Local Soil, Climate, and Geology Considerations

Understanding King County soils and climate helps select the right aggregates for lasting performance. The region includes glacial till, outwash sands and gravels, silt layers, and isolated peat deposits in lowland areas.

Typical ground conditions

• Glacial till and compacted deposits are common on hill slopes and terraces.
• Alluvial outwash near rivers and the Snoqualmie Valley provides sand and gravel lenses.
• Lowland peat and organic soils can require engineered fill and subgrade stabilization.
• Clay pockets and compressible soils in some urban infill areas near waterways.

Climate impacts

• High annual rainfall increases emphasis on drainage aggregates like drain rock and #57 stone.
• Freeze and thaw cycles at elevation call for durable, angular stone for compaction.
• Stormwater regulations in King County encourage permeable surfaces and proper base design for runoff control.

For geotechnical recommendations, pair our materials with local testing or contractor advice to match your site conditions.

How to Choose the Right Aggregate

Choosing appropriate aggregates in King County depends on load, appearance, drainage, and permit requirements. Below are practical tips to guide selection.

Selection tips

• For high traffic driveways, prioritize a strong road base and a compactable surface stone like crusher run followed by driveway gravel.
• For drainage, select clean, well-graded rock like #57 stone or drain rock to keep flows moving.
• For decorative beds and low maintenance yards, river rock and pea gravel provide clean appearance and weed suppression.
• For pathways, use decomposed granite or walkway gravel compacted with edging to maintain lines.

Frequently Asked Questions About Gravel in King County