Order Class A Roadstone and Crushed Stone in Harrison County, IA

Order gravel, stone and aggregate delivery in Harrison County, IA online. Iowa Rock Supply sells bulk material by the ton or by the yard and sends a dump truck to your site.

Start with Class A roadstone, the crushed limestone base course this part of Iowa builds drives and pads on. It is the same material county engineers call roadstone.

Ground Conditions Across Harrison County

Harrison County sits in the Loess Hills and the Missouri River valley. Wind blown silt runs more than 60 feet deep across the zone, and 150 to 200 feet in places.

That silt sheds water fast on the ridges and gullies, and it collapses when it gets saturated. A thin base course on ground like that fails early, because the subgrade moves under the load.

On the river bottoms the problem flips. Flat ground with a high water table and Missouri River flooding is the constraint, so bottomland drives get built up on rock.

Loess erodes as almost nothing else does. It stands in near vertical faces when dry, cuts deep gullies under runoff, and slides when wet.

Along the river, bank cutting and flood scour do the rest.

Timing follows the ground. Hill work waits for the silt to dry, because wet loess will not hold a cut.

Bottomland work waits for the spring rise to pass.

Cold winters bring repeated freeze and thaw that heaves drives and loosens the silt faces of cuts and banks. Frost depth is commonly 42 inches, and the local building official sets footing depth.

Materials Delivered in Harrison County

Class A roadstone is the 3/4 inch crushed limestone base course with the fines left in, so it binds and compacts.

11 and Class C gravel to Gradation No. 10.

Use it under driveways, parking pads, shed bases and farm lanes. The same material shows up as Class A roadstone in county engineer and city entrance standards.

1 inch roadstone is the coarser grade, also called 1 inch minus. Lay it under a finer surface course on a new drive, a soft spot, or a lane that carries heavy equipment.

Clean rock is washed and open graded, so water moves straight through. It goes into subdrains, drainage tile backfill, pipe bedding, septic rock and backfill behind retaining walls.

Limestone screenings are the fines, used for paver and flagstone bedding, joint filling, and a fine top dressing over a compacted roadstone base.

Riprap, also called revetment stone, armors stream banks and river banks, culvert outlets, pond edges and slopes against spring runoff. Section 4130 covers revetment stone, erosion stone and gabion stone by class letter.

Black dirt, which Iowa yards call screened topsoil, handles lawn repair, grading and bed prep. Fill dirt raises grade, fills low ground and backfills before a roadstone course goes down.

Delivery Across Harrison County

Order online and choose a quantity by the ton or by the yard. Each product page has a calculator if you want to size the load before you check out.

Pick a delivery date at checkout. A dump truck arrives and tips the load in one pile on site.

Delivery covers Missouri Valley, Logan, Dunlap, Woodbine, Mondamin, Persia, Pisgah, Modale, Little Sioux and Magnolia. Bottomland sites and hill sites both take a full truck, and the pile lands where the truck can reach.

Keep the order simple: pick the material, pick the quantity, pick the date. The rest is a truck and a pile.

Choosing the Right Material

Crawford County and Shelby County sit on the Southern Iowa Drift Plain, where old pre-Illinoian till lies under a windblown loess mantle usually 5 to 30 feet thick. Beneath it, the Yarmouth-Sangamon paleosol is a thick, gummy grey clay that water will not move through.

That clay changes the drainage choice. Where water cannot pass through the subgrade, a clean open graded stone gives it somewhere to go, and a fines-bearing base course alone will not.

Pottawattamie County shares the Loess Hills and the Missouri River valley ground, so the base and drainage choices there follow the same logic as here.

On Harrison County ground, match the material to the job. Class A roadstone for a compacted base, clean rock where water has to move, riprap where a bank is cutting.

Size the Load and Place Your Order

Work out how much material the job needs and order it by the ton or by the yard. Each product page has a calculator to help you size the load before checkout.

Pick a delivery date, and a dump truck tips the pile on site in Harrison County.