5/8 Minus and Bulk Aggregates for Cowiche, WA

Washington Rock Supply provides gravel and aggregate delivery in Cowiche, WA. If you are surfacing a drive or a parking pad, 5/8 minus is the material to start with.

It is crushed rock with the fines left in, so it packs hard and sheds water instead of soaking it up. That matters on ground that runs dry, then takes a storm all at once.

Materials for Cowiche Projects

This page leads with washed stone, because drainage is the job that decides how the rest of a site performs. Washed means the crusher fines have been taken out, so the stone keeps open voids and water moves through it.

Drain rock, also called 7/8 clean, is the washed stone for footing drains, French drains and curtain drains. Use it in an infiltration trench where you want water to drop away rather than sit.

3/4" Crushed Stone is the washed counterpart to a minus product, so it drains instead of compacting. It suits trench backfill, pipe surround and under-slab drainage.

#4 Crushed Stone is the heavy end of washed drainage stone. It is sized for drywells, where water needs somewhere to go.

Downspout runs and splash pads want rounded stone rather than crushed. Washington River Rock handles dry creek beds, splash pads and rain garden armour.

Large River Rock is the cobble size, used where a smaller stone would be carried off. It holds swales, ditch armour, bank toes and culvert outfalls.

When you need a surface that packs rather than drains, the minus materials do that work. 5/8 Minus is the Washington default surfacing course for driveways, parking pads and shed slabs.

1 1/4 Minus is the structural course that goes below a top course. Its larger top size carries load and stays workable on soft, wet ground.

Delivery to Cowiche and the Surrounding Area

Cowiche sits in Yakima County, and delivery covers the town and the surrounding area. Coverage also reaches Yakima, Selah, Toppenish, Sunnyside and Grandview.

You order online. Quantities are ordered by the ton or by the yard, and each product page has a calculator if you want to size a load before you buy.

At checkout you choose a delivery date that suits the job. A dump truck then tips the load on your site in one pile.

Rural approaches and farm yards are ordinary addresses for this. Have the spot clear before the truck arrives.

Ground and Conditions in Cowiche

Eastern Washington works on a long season either side of a hard winter. The wet weather season for erosion control runs October 1 through June 30.

Once snow falls or the ground freezes, placing and compacting base material stops being practical. Time a granular delivery before that, or plan on spring.

The ground here is windblown loess over Columbia River basalt, and across the Yakima Valley the silt sits deep. Silt sheds water rather than absorbing it, so a storm or a rapid thaw runs off fast.

That runoff cuts rills and gullies in bare loess, and wind off dry silt moves soil too. Cover and a stable surface both help.

Ground in this part of the state freezes properly, so frost heave in an unbound base is something to design for. The county or city building department sets the footing depth figure, and it runs deeper with elevation.

Order Bulk Aggregate for Cowiche

Washington Rock Supply delivers 5/8 minus, washed stone, sand and soil across Cowiche and the rest of Yakima County. Order online, size the load by the ton or yard, and pick your delivery date at checkout.