What is 5/8 minus and what is it used for in Walla Walla County?

5/8 minus is crushed rock with the fines left in, so it compacts hard and sheds water. Locally it is called crushed surfacing top course, or CSTC. It is the standard top course for driveways, parking pads and shed or shop slabs, and it works over a 1 1/4 minus base course on soft ground.

How deep should a gravel driveway base be in Walla Walla County?

Depth depends on your soil, your slope and what the drive carries, so check with your county or city building department on local requirements. Frost depth is set by that department. Use the calculator on the product page to size the quantity once you know the area you are covering.

How much gravel do I need for my project?

Quantities are ordered by the ton or by the yard. Use the calculator on the product page to size the load from your own project numbers, then pick a delivery date at checkout. If the ground is soft or the slope is steep, settle the material choice before you settle the quantity.

Bulk Gravel Delivery in Walla Walla County, WA

Gravel, Stone and Aggregate Delivery in Walla Walla County, WA

If you are pricing a driveway, a shop pad or a drainage run, you want to know what to order and why. Washington Rock Supply delivers gravel, stone and aggregate by the ton across Walla Walla County, WA.

Start with 5/8 minus, called crushed surfacing top course or CSTC on a Washington order sheet. It is crushed rock with the fines left in, so it packs hard and sheds water instead of soaking it up.

Ground Conditions Across Walla Walla County

Walla Walla County spans two ground regions. The Palouse and the Blue Mountain foothills cover Walla Walla, College Place, Waitsburg and Prescott, where windblown loess is piled into rolling hills and reaches 250 feet thick in places.

Burbank and Touchet sit on the Columbia Basin side, where loess lies over basalt, and the Ice Age floods stripped the silt off and left sand and gravel bars behind.

Loess is fine, deep and easily worked, and it moves easily too. On a slope, water that cannot get in runs across the surface instead of soaking down, so any drive or pad needs its runoff routed before it starts cutting.

Erosion follows the same pattern. Long cultivated slopes shed silt in sheets and rills when rain falls on frozen ground, and bare dry silt moves in the wind.

Eastern Washington's wet weather season runs October 1 through June 30. The working season is long and dry through summer and closes when the ground freezes, and once that happens, placing and compacting base material stops being practical.

Winter here also brings warm rain onto frozen or part-thawed ground, which 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 number before you plan footings.

Materials Delivered in Walla Walla County

The minus and clean split is the most useful thing to know before you order. Minus means the crusher fines stay in, so the rock compacts and holds.

Clean or washed means the fines are gone, so it drains.

5/8 minus is the size to lead with.

Contractors and quarries shorten those to CSBC and CSTC and order them as 1 1/4 minus and 5/8 minus. That is how material is described in Washington, not a certificate any yard holds.

Order 1 1/4 minus as the structural course under a drive or slab, then cap it with 5/8 minus. Use drain rock where water sits and the ground needs a path out.

Rounded stone is filed under round rock here rather than crushed. Washington River Rock suits dry creek beds and splash pads, and Large River Rock arms swales and ditch banks where a smaller stone would wash away.

Sand and soil round out an order. Washed Sand goes into concrete mixes, paver setting beds and pipe bedding, while Fill Dirt raises grade and backfills over-excavations before a granular course goes down.

Choosing the Right Material

Columbia County is the closest neighbouring county in the same state, and it sits in Southeast Washington on the same ground. It shares The Palouse and the Blue Mountain foothills ground region, where loess is piled into rolling hills and reaches 250 feet thick in places.

Because the ground is the same, the material choice is the same. Order a compacting minus product such as 1 1/4 minus or 5/8 minus for a drive or pad, and washed stone such as drain rock where you need water to move.

What changes between sites is slope and water, not the county line. On loess, route runoff away from the edge of any surfacing before it starts cutting, and keep the fines in the base where you want it to hold.

Delivery Across Walla Walla County

Washington Rock Supply covers Walla Walla, College Place, Burbank, Waitsburg, Touchet, Prescott and Dixie. You order online, choose a quantity by the ton or by the yard, and pick a delivery date at checkout.

Each product page has a calculator if you want to size the load before you order. A dump truck then tips the material on site in one pile.

Think about where that pile should land before the truck arrives, especially on a slope where loess turns soft in a thaw. A clean, firm spot at the top of the work keeps the material where you need it.

Order Gravel and Rock for Delivery in Walla Walla County

Washington Rock Supply delivers bulk gravel, stone, sand and soil across Walla Walla County, from Walla Walla and College Place to Burbank, Waitsburg, Touchet, Prescott and Dixie. Order online by the ton or yard, pick your delivery date at checkout, and a dump truck tips the load on site.

Choose your material and place your order when you are ready.

Walla Walla County, WA Gravel and Landscape Rock Delivery