When is the best time of year to order base material in Slope County?

Work here follows the weather more than the calendar. Wet clay tracks and approaches turn impassable within an hour of rain, and the season closes early across the Little Missouri Badlands. Long, severe winters bring deep ground frost and a hard spring thaw that heaves and softens existing gravel. Order when the ground is firm enough to take a truck and the site drains between storms.

What is the difference between topsoil and fill dirt?

Topsoil, which North Dakota yards and suppliers call black dirt, is screened and goes on lawns, beds and grade repair where plants need to grow. Fill dirt, also called clay fill, is structural: it raises grade, fills low ground and backfills before a gravel course goes down. Use fill dirt to build the shape and black dirt as the growing layer on top.

What is Class 5 and what is it used for in Slope County?

Class 5 is the standard North Dakota base gravel. Section 816, Table 816-01 sets the gradations, and Section 302 names Class 5 as the traffic service aggregate. It is a compacted base for driveways, parking pads and shop and shed bases.

Slope County, ND Aggregate and Rock Delivery

North Dakota Rock Supply handles gravel, stone and aggregate delivery in Slope County, ND. Class 5 is the base material this part of the state is built on, and it is the right starting point for a drive, a parking pad or a shop floor.

The ground here is deeply eroded soft sandstone, siltstone and bentonitic clay, cut into buttes and short steep ridges. That subgrade decides how a base course behaves long before the gravel does.

Materials Delivered in Slope County

Start with the job. A driveway, a patio, a drain and a garden each call for a different material, and the local name is the one to order by.

Class 5, also called Class 5 gravel or Class 5 aggregate base, is the standard North Dakota base gravel. It goes under driveways, parking pads and shop and shed bases.

Order it as Class 5.

Class 13 is aggregate surfacing for an approach, a lane or a gravel drive where a binding, blade-friendly gravel is wanted instead of a full base course. Order it as Class 13.

Scoria, also called red scoria or clinker, is the red surfacing North Dakotans picture for paths, yards, lanes and parking areas. It comes from burned lignite clinker.

Order it as Scoria.

Washed rock is clean, open stone for drain tile beds, sump discharge, downspout runs and foundation drains. Order it as Washed Rock.

Pea rock, or 3/8 inch pea rock, suits walkways, play areas, dog runs and pipe bedding. North Dakota yards say pea rock more often than Natural Pea Gravel.

Order it as 3/8" Natural Pea Gravel.

Riprap is graded Grade I, II and III here, and it armors coulee and river banks, culvert outlets, dam faces and reservoir shoreline against spring runoff and wave action. Order it as Riprap.

Black dirt is screened topsoil, and it goes on lawns, grade repair and bed prep. Order it as Top Soil.

Fill dirt, also called clay fill, raises grade and backfills low ground before a gravel course goes down. Order it as Fill Dirt.

Ground Conditions Across Slope County

Across the Little Missouri Badlands the ground is bentonitic clay under soft sandstone and siltstone. That clay swells and turns slick when wet, then shrinks and cracks as it dries.

An under-built base moves with it instead of holding.

Short, steep slopes shed water almost at once, so runoff is flashy and gullies cut quickly. A base course on a slope has to be built for water that arrives all at one time, and banks along the Little Missouri are still being cut.

Rapid gully and rill cutting on bare slopes is the other half of the problem, along with slumping on the clay. Riprap and a drainage layer do work that a fines-bearing material cannot do on those banks.

Season timing follows the weather more than the calendar. Wet clay tracks and approaches turn impassable within an hour of rain, and the season closes early.

Long, severe winters bring deep ground frost and a hard spring thaw that heaves and softens gravel drives, approaches and township roads.

Delivery Across Slope County

Order online and choose a quantity by the ton or by the yard. Each product page has a calculator to help size the load, and delivery covers Marmarth, Amidon and the surrounding county.

A dump truck tips the load on site in one pile. You pick the delivery date at checkout, and the truck brings the material to the address you enter.

That is the whole of it.

Choosing the Right Material

Stark County, Hettinger County and Adams County all share the same ground region as Slope County: soft Fort Union sandstone, siltstone, claystone and lignite under a thin soil cover, with swelling clay and sand and gravel on the Missouri River terraces. The ground is the same, so the material reasoning is the same.

Base depth and drainage still carry the decision. On swelling clay, a compacted Class 5 base over ground that drains is the difference between a drive that holds its shape and one that ruts each spring thaw.

For a driveway or pad, start with Class 5. For an approach or lane that wants a binding surface, Class 13 is the surfacing choice.

For water, Washed Rock and 3/4" Crushed Stone move it away from a foundation. For planting, Top Soil and Fill Dirt fix grade before anything gravel goes down.

Order Class 5 and Base Gravel for Slope County

Class 5 is the base material that fits this ground, from a driveway in Marmarth to a pad near Amidon. North Dakota Rock Supply delivers bulk gravel, stone, sand and soil across Slope County.

Pick your material and quantity online and place your order when you are ready.

Gravel, Stone and Soil for Slope County, ND