Order Crushed Base Course and Crushed Stone in McCone County, MT
Montana Rock Supply delivers gravel, stone and aggregate in McCone County, MT. Start with crushed base course, the standard Montana base material for drives, shop pads and parking areas.
Water drives the choice here. Gumbo clay swells and turns greasy when it wets up, then cracks open as it dries.
Water sits on the surface and unsurfaced ground goes soft.
Delivery across McCone County
Order online and pick a quantity by the ton or by the yard. Each product page has a calculator to help you size the load.
Choose your delivery date at checkout.
A dump truck tips the load in one pile at your site. Bulk delivery reaches Circle, Vida and Brockway.
Ground that is dry and firm takes a truck far better than ground that is not.
Materials delivered in McCone County
Order by the job you are building. A driveway, a drain and a set of garden beds each call for a different material.
Crushed base course
Crushed base course is the base material Montana work is built on. In Montana it is specified as crushed base course, not by another state's class name.
The MDT Standard Specifications for Road and Bridge Construction cover it under Section 701.02.4. Grades are named by nominal top size: Grade 5A at 2 inch minus and Grade 6A at 1 1/2 inch minus, with a 3/4 inch minus grade, 7A, developed for MDT as pit sources for the larger sizes ran short.
City and county work is more often written against Section 02235, Crushed Base Course, 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.
Order it for driveways, shop pads, parking areas and shed bases. Build the sub-base up with pit run or fill dirt first, then bring the crushed base course in as the layer that carries the traffic.
Ground conditions across McCone County
Across the Eastern plains, Missouri Breaks and badlands, bentonite-rich gumbo clay weathers off marine shale. The clay swells and turns greasy as soon as it wets up and cracks open when it dries.
That means water sits on the surface instead of soaking away, and unsurfaced roads go soft. An under-built base over gumbo pumps and breaks up.
A clean, free-draining layer under the finished surface gives that water somewhere to go.
Cloudbursts run straight off into the coulees. Expect fast gully and rill cutting, slumping along the breaks, and bank scour.
Riprap armors culvert outlets, ditch banks and slopes where runoff concentrates.
Work follows dry ground. Spring breakup and heavy rain make gumbo roads impassable, so midsummer and early autumn are the dependable window.
Winters 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.
Frost depth figures published across Montana run from about 36 to 60 inches, with eastern plains figures usually quoted at the lower end. The local building department sets footing depth.
Choosing the right material
Roosevelt County and Valley County sit on glacial till over shale, a mix of clay, gravel, sand and silt left by the ice and by glacial lakes. Much of it is heavy and slow-draining, with coulee and river-bottom alluvium cut down through it.
That ground holds water differently from the gumbo clay here. Where till is heavy and slow-draining, a clean drainage layer matters more than extra base depth.
Richland County shares this county's ground region: bentonite-rich gumbo clay weathered off marine shale, with badlands, scoria beds and broken ground. The ground is the same, so the same approach applies.
Match the material to the job. Use 3/4 crushed base course and pit run for drives and pads.
Use washed rock where water has to move. Use crusher fines to bed pavers and pack paths.
Use screened topsoil and garden soil where you are planting.
Questions about base material in McCone County
When is the best time of year to order base material in McCone County?
Midsummer and early autumn are the dependable window. Spring breakup and heavy rain make gumbo roads impassable, and a loaded truck cannot reach soft ground.
Order when the ground is dry and firm enough to take the weight, and pick your delivery date at checkout.
What is the difference between topsoil and fill dirt?
Fill dirt is bulk fill, backfill and raising grade before a base course goes down. Screened topsoil is the planting layer for lawns, grading and bed prep over thin or stony native ground.
Keep them separate: fill goes under, topsoil goes on top where roots reach it.
What is crushed base course and what is it used for in McCone County?
Crushed base course is the standard Montana base material, usually ordered by top size as 3/4 minus. It is used for driveways, shop pads, parking areas and shed bases.
In Montana it is specified as crushed base course under MDT Section 701.02.4 and Section 02235 of the Montana Public Works Standard Specifications.
Order crushed base course for your McCone County project
Crushed base course is the layer that carries a drive, a pad or a parking area here, and gumbo ground underneath is the reason to get it right. Order online by the ton or by the yard, size the load on the product page calculator, and choose your delivery date.
Montana Rock Supply delivers across McCone County.