3/8 Clean for Pathways in Mattawa, WA

Washington Rock Supply offers gravel and aggregate delivery in Mattawa, WA to two kinds of buyers: contractors building drives, pads and drainage, and homeowners fixing a path or a garden bed. Both ask for 5/8 minus by name, because it is the surfacing course this part of Washington builds on.

Mattawa sits in Grant County, where windblown silt lies over basalt and the ground runs dry and loose through the working season. What you put on top of that ground decides how the surface holds up.

Ground and Conditions in Mattawa

Across the Columbia Basin, Yakima Valley and the channeled scablands, the typical ground is windblown loess over Columbia River basalt. The floods stripped the silt off in places and left bare rock; elsewhere the silt sits deep.

A thin base over that silt shows its weakness fast. The material ravels at the edges, ruts form where tires turn, and the surface loses its shape after a wet spell.

The fix is a structural course that carries load, with a finer surfacing course on top of it. A 1 1/4 minus base, also called crushed surfacing base course, goes down first.

Its larger top size and lower fines content keep it workable on soft ground.

Water behaves differently here too. Parts of the basin take only seven to nine inches of rain a year, so the ground stays dry and loose, and silt sheds a cloudburst instead of absorbing it.

Where flood gravel sits at the surface, water drops straight through.

Wind off bare silt moves soil, and short violent runoff cuts rills and gullies when a storm lands on ground with no cover. Irrigation runoff moves soil as well.

The working season is long on either side of a hard winter. Eastern Washington's wet weather season for erosion control runs October 1 through June 30, and once snow falls or the ground freezes, placing and compacting base material stops being practical.

Grant County frost depth is 18 inches, and the county or city building department sets the figure. The ground freezes properly here, unlike west of the Cascades, so frost heave in an unbound base is something to design for.

Materials for Mattawa Projects

Paths and walkways are where fines and screenings do their best work. A minus product keeps its crusher fines, so it compacts underfoot instead of staying loose.

1/4 minus, also called quarter minus or pathway gravel, is the fine end of the minus range. It packs down tight and gives you a firm walking surface for garden paths and side yards.

See Walkway Gravel.

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 makes a setting bed.

See Stone Screenings.

Where you want a washed, fines-free stone instead of a minus, 3/8 clean is the size to ask for. It suits paver joints, permeable paver setting beds and small drain runs.

See 3/8" Crushed Stone.

For the base under all of it, 5/8 minus is the Washington default surfacing course. The fines are left in, so it packs hard and sheds water instead of soaking it up.

It works for driveways, parking pads, and shed and shop slabs. See 5/8 Minus.

Drainage is the other half of the job. Drain rock, also called 7/8 clean or washed rock, has no fines, so it keeps its voids in footing drains, French drains and infiltration trenches.

See Drain Rock.

Delivery to Mattawa and the Surrounding Area

Order online, and choose your quantity by the ton or by the yard. Each product page has a calculator if you want to size the load before checkout, and you pick a delivery date there.

A dump truck tips the load in one pile on site. Have the spot clear and reachable, and the material lands where the truck can back in.

Delivery covers Mattawa and the rest of Grant County, including Moses Lake, Ephrata, Quincy, Warden and Royal City. Rural drives, farm approaches and equipment pads are all part of the work here.

Order Gravel and Aggregate for Your Mattawa Project

Work out how much material you need with the calculator on each product page, then order by the ton or the yard and pick your delivery date. Washington Rock Supply delivers 5/8 minus, drain rock, screenings and washed stone across Mattawa and Grant County.

Place your order online when you are ready.