Order Crushed Base Course and Crushed Stone in Garfield County, MT
If you are building a driveway, a shop pad or a drainage run, Montana Rock Supply handles gravel, stone and aggregate delivery in Garfield County, MT. Most ground work here starts with crushed base course, the material Montana crews also call 3/4 minus.
This is gumbo country. Bentonite clay weathered off marine shale swells when it wets up and cracks when it dries, so the ground under any drive or pad matters as much as the stone you put on it.
Materials Delivered in Garfield County
Crushed base course is the standard Montana base material. It is ordered by top size, and 3/4 minus is the common call.
Contractors who want it by name can order 3/4 Crushed Base Course for driveways, shop pads, parking areas and shed bases.
Base material in Montana is specified as crushed base course under MDT Section 701.02.4, where grades are named by nominal top size: Grade 5A at 2 inch minus and Grade 6A at 1 1/2 inch minus. City and county work is often written against Section 02235 of the Montana Public Works Standard Specifications.
County road standards call sizes out as 3 inch minus sub-base and 1 inch minus crushed base or top course.
Washed stone and sand round out the list. 3/4" Crushed Stone works for drainage beds, pipe bedding and construction entrances, while Mason Sand covers brick and block work and paver joints.
Delivery Across Garfield County
You order online and a dump truck brings the load to your site. Choose a quantity by the ton or by the yard, and use the calculator on each product page to size the load.
A bulk delivery means the truck tips the material in one pile on site. Have the spot clear and reachable before the truck arrives, and know where you want the pile to land.
Montana Rock Supply delivers across Garfield County, including Jordan, Angela, Brusett, Cohagen, Mosby and Sand Springs.
Ground Conditions Across Garfield County
Gumbo is the driver here. Bentonite clay swells and turns greasy as soon as it wets up, and it cracks open when it dries.
Across the Eastern plains, Missouri Breaks and badlands, the ground also brings badlands, scoria beds and broken country, with sand, gravel and cobble terraces along the big rivers. That mix means drainage design matters as much as base thickness.
Erosion follows the same pattern. Fast gully and rill cutting shows up in shale and clay badlands, slumping runs along the Missouri Breaks, and bank scour hits the river terraces.
Work follows dry ground. Spring breakup and heavy rain make gumbo roads impassable, so midsummer and early autumn are the dependable window for a delivery.
Winters here are cold and dry, with deep frost and wide day-to-night swings. Ground that thaws on a chinook afternoon and refreezes overnight heaves gravel roads and opens up drives.
Published frost depth figures across Montana run from about 36 to 60 inches, with eastern plains figures usually quoted at the lower end. These are footing depth figures, and the local building department sets footing depth.
Choosing the Right Material
Custer County shares Garfield County's ground region: bentonite-rich gumbo clay weathered off marine shale, with badlands, scoria beds and the broken ground of the Missouri Breaks. The ground is the same, and so is the reasoning about base and drainage.
Petroleum County sits on Central Montana benchlands and island ranges. Deep silty and clayey prairie soils cover the benches and the Judith Basin, with gravelly terraces along the Missouri, Judith and Musselshell and shallow stony ground on the island ranges.
That is finer ground than Garfield County's gumbo. A silt and clay prairie holds water differently from swelling bentonite, so drainage stone and a clean washed layer matter more where water has nowhere to go.
Valley County is glacial till over shale, a mix of clay, gravel, sand and silt left by the ice and by glacial lakes, much of it heavy and slow-draining. Till drains poorly in its own right, which puts the same weight on washed rock and open-graded stone.
- For a drive or shop pad, start with crushed base course and finish with road mix.
- For deep fill or raising grade, use pit run under a crushed base course.
- For drains and downspouts, use washed rock so the fines stay out.
- For paver bedding, use crusher fines.
- For beds and borders, use rounded river rock instead of bark.
Order Gravel, Stone and Topsoil for Garfield County Projects
Montana Rock Supply covers driveways, shop pads, parking areas, drainage runs, paver bedding and bed work across Garfield County. Order the material online, size the load by the ton or yard, and pick your delivery date at checkout.