Railroad Ballast, Stone and Soil Delivery in Black Diamond, WA

Washington Rock Supply handles gravel and aggregate delivery in Black Diamond, WA, and 5/8 minus is the surfacing course most drives and pads here start from. It is crushed rock with the fines left in, so it packs hard and sheds water instead of soaking it up.

Black Diamond sits on the Puget Sound lowland, where a dense till cap sits under the upper soil and stops winter rain from draining away.

Materials for Black Diamond Projects

Slope, swale and bank protection is coarse stone work. The pieces have to be heavy enough to stay put when winter water comes off a cut slope or runs down a ditch.

RipRap is the material for shoreline, streambank, culvert outfall and cut-slope protection.

Large River Rock, sold as 2 to 8 inch round, armours swales, ditch lines, bank toes and culvert outfalls. Rounded stone this size stays in place where a smaller stone would be carried off in a winter storm.

Railroad Ballast is the coarse, open-graded rock used under rail spurs, yard track and heavy equipment pads. Always ask for it by the full name.

Drain Rock, also called 7/8 clean or washed rock, is washed with no fines, so it keeps its voids. It goes into footing drains, French drains, curtain drains and infiltration trenches.

Below the coarse sizes, the minus products build the surface. 5/8 Minus is the Washington default top course for driveways, parking pads and shed slabs, and 1 1/4 Minus is the structural course placed under it.

Delivery to Black Diamond and the Surrounding Area

You order online and pick a delivery date at checkout. Quantities are ordered by the ton or by the yard, and each product page has a calculator to help you size the load.

A dump truck tips the load in one pile on your site. Delivery covers Black Diamond and the rest of King County, including Seattle, Bellevue, Kent, Renton and Federal Way.

Ground and Conditions in Black Diamond

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

That timing shapes the work. Base, paving and paver jobs get scheduled for the dry months, and winter work means keeping the grade covered.

The ground here is glacial, laid down by the Vashon ice sheet. A dense till cap sits over advance outwash sand, and the lower part of that till is hard enough that crews call it hardpan.

Perched water is the driver. Rain soaks the loose upper soil, reaches the dense 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 on this ground.

Winter rain perching where outwash sand meets the clay below is what puts bluffs and cut slopes in this part of the state on the landslide maps. The same perched water undercuts fill and cut slopes on a smaller scale.

Winters here are mild and wet, and the ground seldom freezes deep. It is saturation rather than frost that softens a base, so a drive that was firm in August can rut in February.

Questions About Stone and Delivery in Black Diamond

What stone should I use for drainage in Black Diamond?

Use a washed stone that keeps its voids. Drain Rock, also called 7/8 clean, is the usual choice for footing, French and curtain drains and for infiltration trenches.

For trench backfill, pipe surround and under-slab drainage, 3/4 clean is the washed counterpart to a minus product. A minus product compacts instead of draining, so keep it out of a drain run.

What should I have ready when the truck arrives?

Have the drop spot clear and reachable, with nothing overhead and room for a truck to tip its load. The driver tips the material in one pile and does not spread or place it.

Quantities are ordered by the ton or by the yard, so size the load on the product page calculator before you pick your delivery date at checkout.

Order Gravel and Stone Delivery in Black Diamond

Washington Rock Supply delivers bulk gravel, crushed stone, sand, topsoil and mulch across Black Diamond and King County. Coarse stone for slope, swale and bank protection is here, along with the 5/8 minus and 1 1/4 minus that build the surface above it.

Choose your material, size the load, and pick a delivery date at checkout.