Gravel, Stone and Soil for Nez Perce County, ID
Idaho Rock Supply handles gravel, stone and aggregate delivery in Nez Perce County, ID. If you are building a driveway, setting a parking pad or cutting a drainage run, the load usually starts with road mix.
Road mix is what yards in this part of Idaho call crushed base with the fines left in. It locks up under a roller and carries the base course for drives, pads and shed slabs.
Scroll to the calculator on any product page to size your order.
Ground Conditions Across Nez Perce County
The ground across the Palouse hills and the Clearwater and Snake canyons starts with deep windblown loess. In places it lies tens of feet thick over Columbia River basalt.
That silt loam seals when rain hits it. Water sheds instead of soaking in, so long slopes push runoff onto roads, drives and yards.
Water also perches where the loess sits on basalt. A base course laid on ground like that pumps and shifts unless the water has somewhere to go.
Sheet and rill erosion on cropped loess slopes here is among the heaviest anywhere in the country. Canyon roads, culverts and creek banks scour under spring runoff and summer cloudbursts.
Sticky loess mud through the wet months is the real constraint on hauling and compaction. Late spring through fall is the practical window, and the canyon towns get a longer one than the prairie above them.
Winters on the prairie are cold and wet with frequent freeze and thaw. The canyon floor at Lewiston is the lowest and mildest ground in Idaho and freezes least.
No published frost figure was found for these counties. Towns here commonly work to something in the range of 24 to 30 inches, and Idaho code leaves the frost line to the local jurisdiction, so the building official sets it.
Materials Delivered in Nez Perce County
State highway work follows the ITD Standard Specifications for Highway Construction. Section 703.04 covers aggregate for untreated base, treated base and road mix and is the source of the 3/4 inch minus gradation, and Section 703.11 covers granular subbase.
City, county and highway district work is usually written to the Idaho Standards for Public Works Construction. Section 802 covers crushed aggregate in Type I and Type II and Section 801 covers uncrushed aggregate.
Road mix is the load to start with, and 3/4 minus is the same material asked for by size. A contractor ordering 3/4 minus and a homeowner ordering road mix are asking for the same load.
On public works plans the same base material is written as crushed aggregate, called out by Type I or Type II rather than by a class number. Those designations say how material is specified locally, nothing more.
Under it, pit run brings grade up and fills holes before the base goes on. Around a foundation or a drainfield, drain rock gives water a path out.
For a drive surface, 3/4 inch crushed rock is angular and stays put. 3/8 chip does the same job on a path or a leveling course, and Natural Pea Gravel is round, so it rolls underfoot.
River rock, sold here as round rock or Snake River rock, covers decorative beds and dry creek beds. Cobble takes the heavier decorative and swale work, usually in the 2 inch to 10 inch range.
Rip rap armors creek banks, culvert outlets and pond edges against runoff. Screened topsoil and garden soil build the planting layer where the native ground is too thin, too stony or too alkaline to plant into.
Sand rounds out the list. Washed concrete sand beds pavers and slabs and handles concrete work, and mason sand goes into brick and block work and paver joints.
Fill dirt backfills and raises grade. Screenings bed pavers and flagstone and surface compacted pathways, and bark mulch holds moisture in beds and tree rings through a dry Idaho summer.
Delivery Across Nez Perce County
Order online and choose your quantity by the ton or by the yard. Each product page carries a calculator if you want to size the load before you order.
Pick a delivery date at checkout and a dump truck tips the load on site in one pile. Coverage runs across the county, including Lewiston, Lapwai, Culdesac and Peck.
Choosing the Right Material
Latah County and Clearwater County sit on the same ground as Nez Perce County. Deep windblown loess over Columbia River basalt, with bare rimrock and talus in the canyons and thinner ash-capped forest soils higher up.
Ground like that behaves the same way on both sides of the line. The base and drainage choices follow the same reasoning.
Idaho County spans more than one zone. It takes in the Palouse hills and the Clearwater and Snake canyons and also the Central Idaho mountains and high valleys.
Where the ground turns to mountain and high valley, you are off the loess. Base and drainage choices there answer to different ground than the loess slopes do.
Order Road Mix and Aggregate in Nez Perce County
Size the load on the product page, pick your ton or yard, and set a delivery date at checkout. Idaho Rock Supply brings road mix, drain rock, chips, sand and topsoil to addresses across the county.
Place your order online when you are ready.