Gravel and Aggregate Delivery in Palouse, WA

Washington Rock Supply handles gravel and aggregate delivery in Palouse, WA for contractors and homeowners alike. Some orders are a farm shop pad, some are a garden path, and both start with the same question about what the ground will do.

On the deep loess of the Palouse hills, 5/8 minus is the surfacing course that answers it.

You order online by the ton or the yard, size the load with the calculator on each product page, and pick a delivery date at checkout.

Materials for Palouse Projects

Base and driveway surfacing does the heavy lifting on most sites here. The Washington default is 5/8 minus, also called crushed surfacing top course or CSTC: crushed rock with the fines left in, so it packs hard and sheds water instead of soaking it up.

It surfaces driveways, parking pads, and shed or shop slabs.

Under that top course goes 1 1/4 minus, the crushed surfacing base course, or CSBC. Its larger top size and fewer fines let it carry load and stay workable on soft, wet ground.

For a long rural drive or equipment parking, driveway gravel is sold as a blend alongside the graded courses.

The minus and clean split matters. Minus products hold their fines and compact; washed products have the fines taken out and drain.

Getting that backwards is how a base turns spongy or a drain trench fills with silt.

Washed stone covers the drainage side. Drain rock, also called 7/8 clean, keeps its voids where a perched water table sits on till.

For trench backfill and pipe surround, 3/4" Crushed Stone drains instead of compacting, and 3/8" Crushed Stone suits small drain runs and permeable paver joints.

Sand and soil round out a job. Washed Sand goes into concrete mixes and paver setting beds, while Mason Sand serves mortar, stucco and joint sweeping.

Fill Dirt raises grade and backfills over-excavations before a granular course goes down, and screened Top Soil handles lawn repair and new turf.

Decorative stone finishes beds and water features. Washington River Rock, or round rock, lines dry creek beds and downspout splash pads, and Natural Pea Gravel works for play areas, dog runs and planting beds.

Ground and Conditions in Palouse

The ground here is loess: windblown silt piled into the rolling Palouse hills, fine, deep and easily worked, and easily moved. Basalt comes back to the surface in the canyons and along the Snake.

That fine silt is why a drive needs a base that carries load rather than one that simply covers the dirt.

The bigger driver is water that cannot get in. When the top inch of loess thaws over frozen soil below, rain and snowmelt run across the surface instead of soaking in, and every slope becomes a drainage path.

Anything built on a slope here needs runoff routed before it starts cutting. That is where drain rock and the clean, washed sizes earn their place, in footing drains, French drains and infiltration trenches that give the water somewhere to go.

Erosion follows the same pattern: sheet and rill erosion of loess on long slopes, driven by rain falling on frozen soil. The wet season runs October 1 through June 30, and the working season closes when the ground freezes.

The worst risk is not high summer but the thaw.

Cold winters freeze the soil to depth, and a late-winter pattern of warm rain on frozen or part-thawed ground is the most damaging condition in this part of the state. Frost depth is set by the county or city building department, so confirm the local figure.

Delivery to Palouse and the Surrounding Area

Bulk material arrives by dump truck and is tipped on site in one pile, so have the drop area clear and reachable before the truck arrives. You choose a quantity by the ton or by the yard when you order online, and the calculator on each product page helps you size the load.

Palouse sits in Whitman County, and delivery covers the surrounding county as well, including Pullman, Colfax, Tekoa, St. John and Rosalia.

Pick your delivery date at checkout.

Order Base, Drainage and Landscape Material in Palouse

Washington Rock Supply delivers bulk gravel, crushed stone, sand, topsoil and decorative rock to Palouse and Whitman County. Whether the job is a driveway, a shop pad, a drainage trench or a garden bed, the material is ordered online by the ton or the yard and tipped on site.

Start your order when you are ready.