Road Mix Delivery for Cobalt, ID
Gravel and aggregate delivery in Cobalt, ID starts with the ground you are building on. Across the Central Idaho mountains and high valleys, thin coarse soil sits over granite, and meltwater runs off instead of soaking in.
Idaho Rock Supply delivers road mix, gravel, stone, sand and topsoil by the ton. Road mix is the base this market builds on.
Delivery to Cobalt and the Surrounding Area
Order online and pick your material. Choose a quantity by the ton or by the yard, then pick a delivery date at checkout.
Each product page has a calculator if you need help sizing the load. A dump truck tips the material in one pile at your site.
Idaho Rock Supply serves Cobalt and the rest of Lemhi County. That includes Salmon, Leadore, Carmen, Gibbonsville and North Fork.
Long rural approaches are common here, so have the drop area clear before the truck arrives. The truck needs room to tip the load and pull out.
Materials for Cobalt Projects
Raising grade comes first on most ground here. Fill dirt brings a low spot up before a base course goes on top.
Then comes the base. Road mix, also called 3/4 road mix or 3/4 minus, is crushed base with the fines left in so it locks up.
Use it under driveways, parking pads, shop floors and shed slabs.
Pit run is unprocessed gravel straight from the pit, rock and fines mixed. It works as sub base under road mix, as structural fill and for filling holes.
For a driveway, cap the base with driveway gravel. For a patio, bed pavers on washed sand and finish with 3/8 chip, which knits together and stays put.
For a drain, use drain rock, a clean angular rock for french drains, foundation drains, drywells and downspout runs.
Ground and Conditions in Cobalt
Start from the soil. Thin, coarse ground over granite weathers down to sandy Stone Screenings, and it washes out readily once it is disturbed.
Under-built bases fail fast on ground like that. Get the sub base right and the surface holds.
Drainage splits two ways here. Deep granitic and outwash ground drains fast.
Shallow soil over bedrock and subgrade that is still frozen push meltwater across the surface instead.
Valley floors near the rivers carry a high water table through spring. That is where a drainage layer earns its place.
Spring snowmelt and rain on snow scour creek banks and mountain roads. Rip rap armors culvert outlets, canal banks and cut slopes against that runoff.
This is the shortest working season in the state. Snow and frozen ground close out base and paver work from late fall until the ground dries in late spring.
The reliable window runs early summer to early fall. Plan grade and base work inside it.
Frost depth is set by the local building official, and deep mountain frost drives a heavy spring breakup that ruts drives as it comes out.
Questions About Material in Cobalt
What is the best base under pavers in Cobalt?
Road mix, sold here as 3/4 road mix or 3/4 minus, is the compacted base for paver work. It is crushed base with the fines left in so it locks up.
Bed the pavers on washed sand over that base, then sweep screenings or 3/8 chip into the joints. On this ground the base course does the work, so build it before you set a single paver.
Do you supply contractors working in Cobalt?
Yes. Idaho Rock Supply delivers bulk material to Cobalt and across Lemhi County, including Salmon, Leadore, Carmen, Gibbonsville and North Fork.
Order online, choose your quantity by the ton or by the yard, and pick a delivery date at checkout. Base, fill, drain rock, sand and topsoil all ship the same way.
Order Road Mix and Fill for Your Cobalt Project
Road mix is the base Cobalt work starts from, and fill dirt gets the grade up before it goes down. Pick your material, set your quantity by the ton or yard, and choose a delivery date online.
Idaho Rock Supply tips the load at your site in Lemhi County.