Railroad Ballast, Stone and Soil Delivery in Mercer Island, WA

Washington Rock Supply brings gravel and aggregate delivery in Mercer Island, WA to your driveway, garden or shoreline job. Start with 5/8 minus, the crushed surfacing top course local crews build drives and pads on.

Slopes, swales and banks take a coarser stone here, and the ground below decides how the rest of the order stacks up.

Materials for Mercer Island Projects

Coarse stone does the heavy work on slope, swale and bank protection in Mercer Island. Rock that is large enough to stay put under winter flow is what holds a cut slope and lines a ditch.

Riprap is the shoreline and streambank stone. Quarry spalls are the smaller size class below those grades, for outfalls and smaller banks.

Large River Rock is 2 to 8 inch round stone, used for swale and ditch armour, bank toes and culvert outfalls. Rounded stone rolls, so it belongs where water moves rather than where a machine works.

Washington River Rock is the smaller round rock for dry creek beds, downspout splash pads and rain garden armour. It is a finishing stone, not a structural one.

Not every job is a slope. 5/8 Minus is the Washington default surfacing course: crushed rock with the fines left in, so it packs hard and sheds water instead of soaking it up.

Use it over a 1 1/4 Minus base course, which carries load on soft ground.

Delivery to Mercer Island and the Surrounding Area

You order online and pick your quantity by the ton or by the yard. Each product page has a calculator if you want to size the load before you check out.

Mercer Island sits in King County, and coverage runs to Seattle, Bellevue, Kent, Renton and Federal Way on the same schedule. You choose your delivery date at checkout, and a dump truck tips the load on site in one pile.

Have the drop spot clear and reachable before the truck arrives. Bulk loads land where the truck can back in, so gates, low branches and parked cars are worth sorting out first.

Ground and Conditions in Mercer Island

The wet season runs October through April across the Puget Sound lowland. In that window, exposed soil under the state stormwater manual for western Washington has to be stabilized within two days, against seven in summer.

That pushes base, paving and paver work into the dry months, and it means winter deliveries need the grade kept covered. Schedule the granular course for a stretch of dry weather.

The ground is glacial, laid down by the Vashon ice sheet: a dense till cap over outwash sand. Rain soaks the loose upper soil, hits the till and stops, so perched water sits close to the surface all winter.

Water that cannot drain down has to go sideways to daylight. That is why footing drains and washed drain rock do so much of the work on Puget Sound lowland sites, and why a base that was firm in August can rut in February.

Order Gravel and Stone for Mercer Island

Washington Rock Supply delivers bulk gravel, crushed stone, sand, topsoil and mulch across Mercer Island and the rest of King County. Choose your material by its local name, set the quantity by the ton or the yard, and pick a delivery date at checkout.