Order Class A Roadstone and Crushed Stone in Dubuque County, IA
Iowa Rock Supply handles gravel, stone and aggregate delivery in Dubuque County, IA. The base material here is Class A roadstone, a crushed limestone with the fines left in so it binds and compacts.
This is the Paleozoic Plateau, the driftless northeast, where soil sits thin over limestone and water moves down through rock instead of across it.
Materials Delivered in Dubuque County
Order by project. A driveway, a patio and a drain each take a different material.
That section defines Class A crushed stone and Class B crushed stone to Gradation No.
11, and Class C gravel to Gradation No. 10.
County engineers and city entrance standards call the same material roadstone and write it as Class A roadstone. Section 4130 covers revetment stone, erosion stone and gabion stone by class letter, and Section 4123 covers modified subbase.
For a patio, start with Washed Sand for bedding and leveling under slabs and pavers, then Mason Sand for brick and block mortar and paver joints. For a drain, #57 Stone and 3/4" Crushed Stone both work as pipe bedding and trench backfill.
Ground Conditions Across Dubuque County
Across the Paleozoic Plateau, the driftless northeast, soil is thin over limestone, dolomite, sandstone and shale, with a near absence of glacial deposits. Bedrock is shallow on the ridgetops and exposed in the valley walls, and the loess cover is patchy.
That ground does two things to a base. Thin soil over rock leaves nowhere for water to sit, so an under-built drive loses its shape fast.
Shallow bedrock on a ridgetop also limits how much you can cut before you are working against rock.
Karst drives the drainage here. Water disappears into sinkholes, fractures and underground passages rather than running off the surface, springs run year round, and steep valley sides send runoff down fast after a storm.
Runoff on steep slopes scours drives and lanes, and flash flooding works the narrow bedrock valleys. Bank cutting shows on the Upper Iowa, Turkey, Yellow and Maquoketa rivers, which is where revetment stone earns its place.
Steep drives and switchback lanes are the constraint on the working season. Winter access on grades is the reason surfaces get topped up in the fall.
Cold winters in deep, shaded valleys work frost into fractured rock and thin soil, breaking up surfaces on steep lanes and drives each spring. Frost depth here is commonly 42 inches, the figure Dubuque publishes, and the local building official sets footing depth.
Choosing the Right Material
Dubuque County sits on the Paleozoic Plateau, the driftless northeast. Delaware County and Jackson County both span into that same ground region, so the base and drainage choices there follow the same thin soil over rock.
Jones County is different. It sits on the Iowan Surface, loamy glacial till planed down by cold-climate erosion, with a thin and patchy loess cover and a residual stone line or pebble band near the surface.
That till holds water differently from thin soil over fractured rock. A base there deals with loamy ground and scattered granite and quartzite erratics, while limestone bedrock is shallow along the eastern edge.
On the Paleozoic Plateau, drainage matters as much as the base itself. Clean, open graded stone lets water move through instead of sitting against a compacted layer.
Delivery Across Dubuque County
Order online and pick a quantity by the ton or by the yard. Each product page has a calculator, and you choose a delivery date at checkout.
A dump truck tips the load in one pile on site. Bulk delivery reaches Dubuque, Dyersville, Epworth, Cascade, Peosta, Farley, New Vienna, Worthington, Holy Cross, Sherrill, Bernard and Durango.
Steep drives and lanes are worth thinking about before you order. Size the load on the calculator and set the delivery date at checkout.
Questions About Material in Dubuque County
When is the best time of year to order base material in Dubuque County?
Work fits between the spring thaw and the fall freeze. Steep drives and switchback lanes are the constraint, and winter access on grades is the reason surfaces get topped up in the fall.
Ordering ahead of the freeze gives the surface time to settle before the ground locks up.
What is the difference between topsoil and fill dirt?
Topsoil is screened black dirt, the dark prairie soil Iowa yards are known for, and it goes on lawn repair, grading and bed prep. Fill dirt is clay or sandy fill used to raise grade, fill low ground and backfill before a roadstone course goes down.
One grows plants, the other builds elevation.
What is Class A roadstone and what is it used for in Dubuque County?
Class A roadstone is 3/4 inch crushed limestone with the fines left in, so it binds and compacts.
11, and county engineers and city entrance standards write it as Class A roadstone. It is the standard base for driveways, parking pads, shed bases and farm lanes.
Order Class A Roadstone for Your Dubuque County Project
Class A roadstone is the base most drives, pads and lanes in Dubuque County start from. Add clean rock for drainage, screenings for bedding, or topsoil for the finish.
Order online, size the load on the calculator, and pick your delivery date at checkout.