Bulk Gravel and Stone Delivery in Snohomish County, WA
Washington Rock Supply handles gravel, stone and aggregate delivery in Snohomish County, WA. The wet season runs October through April, and exposed soil in western Washington has to be stabilized within two days in that window.
That timing shapes when a load goes down.
5/8 minus is the Washington default surfacing course. It is crushed rock with the fines left in, so it packs hard and sheds water instead of soaking it up.
Plan the grade work for the dry months and keep winter deliveries to what you can cover.
Materials Delivered in Snohomish County
5/8 minus is also called crushed surfacing top course, or CSTC.
Contractors and quarries shorten that to CSTC and order it as 5/8 minus.
It goes down on driveways, parking pads, shed and shop slabs. The fines stay in the blend, so it compacts into a firm surface rather than draining like a washed stone.
1 1/4 minus is the base course grading in the same section, with a 1 1/4 inch top size, shortened to CSBC. It is the structural course under a drive, parking area or slab, placed below a 5/8 minus top course.
Drain rock is also called 7/8 clean or washed rock. It is washed with no fines, so it keeps its voids where a perched water table sits on till.
3/4 clean is the washed counterpart to a minus product, so it drains instead of compacting. It suits trench backfill, pipe surround, drain fields and under-slab drainage.
3/8 clean covers paver joints, permeable paver setting beds and small drain runs.
Crusher dust, also called 3/8 minus or screenings, is a minus product that compacts rather than drains. It beds pavers and flagstone, fills joints and forms setting beds.
For a firm walking surface, 1/4 minus packs down tight on garden paths and side yards.
Washed sand goes into concrete mixes, paver setting beds, pipe bedding and drainage sand. Washing takes the silt out, which matters on a site working through the wet season.
Fill dirt raises grade and backfills over-excavations before a granular course goes down. Screened topsoil covers lawn repair, new turf and grading out settlement.
Delivery Across Snohomish County
You order online and choose a quantity by the ton or by the yard. Each product page has a calculator, and you pick a delivery date at checkout.
Delivery covers Everett, Marysville, Edmonds, Lynnwood, Lake Stevens, Mukilteo, Mountlake Terrace, Arlington, Monroe, Bothell, Snohomish, Stanwood, Sultan and Granite Falls. The county spans two ground regions, so the same material can behave differently from one address to the next.
On the Puget Sound lowland side, glacial ground left by the Vashon ice sheet puts a dense till cap over advance outwash sand. Rain soaks the loose upper soil, reaches the till and stops, so the water table sits close to the surface all winter instead of draining away.
Anything built on till needs the water taken sideways to daylight. That is why footing drains and washed drain rock do so much of the work here.
Ground Conditions Across Snohomish County
A thin base shows its failure first as rutting and pumping where water sits under the surface. On till, the perched water has nowhere to go, so the granular course has to move it sideways.
In the Cascade Range and the east-slope valleys, the ground is thin and stony over volcanic and granitic rock, with glacial and river gravel on the valley floors. The west slope takes 75 to 90 inches a year near the crest and sheds it fast off steep ground.
The east-slope valleys are dry, some under 10 inches a year, and their trouble is snowmelt and cloudburst runoff arriving at once on ground with little cover. Steep-slope runoff scours road shoulders, ditches and culvert outfalls.
Bluff failure is the lowland erosion driver. Winter rain perches where outwash sand meets the clay below it, and the same perched water undercuts cut slopes and fill on a smaller scale.
The working season in the mountain valleys runs roughly from late spring to early autumn, later at elevation. Frost heave in a gravel drive is an east-slope and high-country problem in a way it is not down in the Puget lowland.
Choosing the Right Material
King County and Skagit County both span the Puget Sound lowland and the Cascade Range and east-slope valleys, the same two ground regions Snohomish County spans. The ground is the same, so the material logic carries across.
Kitsap County sits on Puget Sound lowland ground only: the Vashon till cap, advance outwash sand below it, then the silt and clay of the Lawton beds. Recessional outwash gravel fills its valley floors, and its deltas and tideflats carry soft silt.
That means Kitsap has no mountain-valley ground to plan around. The lowland drainage problem is the whole picture there, so a washed layer and a compacting top course do the work.
Order Gravel, Stone and Soil for Snohomish County
Match the material to the job: 5/8 minus for a compacting surface, 1 1/4 minus below it on soft ground, and washed stone where water has to move. Each product page has a calculator, and quantities are ordered by the ton or by the yard.