Bulk Aggregate Delivery Across Polk County, IA

If you are planning a driveway, a parking pad or a drainage run, Iowa Rock Supply handles gravel, stone and aggregate delivery in Polk County, IA. Class A roadstone is the base most of that work starts from here.

The ground under this county is thick, compact pebbly loam till left by the Des Moines Lobe. That sets what a base course has to do.

Ground Conditions Across Polk County

Across the Des Moines Lobe the soil is young glacial ground, a compact pebbly loam till of the Dows Formation. It runs deep, and meltwater channels left sand and gravel behind in places.

This is also pothole country. The drainage network is young and inefficient, and kettles and closed depressions hold water.

Most of the ground drains only because it is tiled. Snowmelt and spring rain sit on the surface where the ground below is still frozen, and that standing water is what thins out a base course.

A driveway or pad built over ground that holds water shows the failure first at the edges, where the stone spreads and ruts form. A compacted roadstone layer with the fines left in gives you a bound surface that holds its shape.

Erosion on the Des Moines Lobe is less about slope than about concentrated runoff. Ditch and tile outlet scour, bank cutting on the major rivers and washouts on the moraine ridges are the usual places.

Riprap armors those spots. Use it on culvert outlets, pond edges and stream banks where spring runoff cuts.

Compaction waits for the frost to come out and for the flat ground to shed its spring water. Base and paver work runs from late spring to the fall freeze, and a wet spring shortens that window.

Winters here are long and cold, and repeated freeze-thaw heaves gravel drives, lanes and field entrances as the ground lets go in spring. Frost depth is commonly 42 inches, but the local building official sets footing depth and northern jurisdictions may ask for more.

Materials Delivered in Polk County

Class A roadstone is the crushed limestone base course with the fines left in, so it binds and compacts. County engineers and city entrance standards write it as Class A roadstone.

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It goes under driveways, parking pads, shed bases and farm lanes.

1 inch roadstone is the coarser grade of the same crushed limestone. Lay it under a finer surface course on a new drive, a soft spot or a lane that carries heavy equipment.

3/4 inch clean stone is washed and open graded. It surfaces a drive where you want a loose, free draining stone, and it beds pipe and backfills a trench.

Natural Pea Gravel suits walkways, play areas and patio bedding. Iowa says Natural Pea Gravel, not pea stone, and it also handles small drainage runs.

Mason sand goes into brick and block mortar, paver joints, play areas and horse arena footing. Washed sand beds and levels under slabs and pavers.

Screened topsoil, which Iowa yards call black dirt, handles lawn repair, grading and bed prep. Fill dirt raises grade and backfills before a roadstone course goes down.

Delivery Across Polk County

You order online and choose a quantity by the ton or by the yard. Each product page has a calculator, and it is the simplest way to size a load before you check out.

Pick a delivery date at checkout, and a dump truck tips the load on site in one pile. Coverage runs to Des Moines, Ankeny, Johnston, Altoona, Grimes, Clive, Pleasant Hill and Bondurant.

It also reaches Polk City, Windsor Heights, Mitchellville, Elkhart, Runnells and Alleman. Bulk material arrives by the ton or by the yard, sized to the job you described.

Choosing the Right Material

Warren, Jasper and Marion counties sit on the Southern Iowa Drift Plain, which is old pre-Illinoian till under a windblown loess mantle. That ground is different from the Des Moines Lobe till under Polk County.

The Drift Plain carries a thick, gummy grey clay paleosol that water will not move through. Farmers there call working in it gumbo, and it changes what a base course has to do.

On ground like that, a clean open graded stone for drainage matters more than it does on the loam till here. Water that cannot move down through the clay needs somewhere else to go.

Polk County's own ground still holds water in kettles and closed depressions, so a subdrain of clean rock is worth planning wherever a low spot sits near a drive or pad.

Order Bulk Aggregate for Your Polk County Project

Start with the calculator on the product page and settle your quantity before you order. Class A roadstone, clean rock, screenings, sand and topsoil are all ordered online by the ton or by the yard.

Pick your delivery date at checkout and a truck tips the load on site. Place your order for Polk County delivery today.