Gravel Delivery FAQ: Ohio Yardage, ODOT Numbers and Ground

Two numbers cause more confusion in this state than anything else: 304 and 411. They sit next to each other on a quote, they are both crushed limestone with fines in them, and they do different jobs. The 304 goes down as the compacted base and the 411 goes over it as the running surface, so ordering one when the job needed both is where most Ohio driveway trouble starts. The questions below work outward from that, through the yardage, the timing and the ground.

Yardage, ODOT numbers and the Ohio building year

Why does a yard cover 108 square feet at 3 inches and only 54 at 6?

A cubic yard is 27 cubic feet, so the coverage falls as the depth rises. At 3 inches it covers about 108 square feet, which is the figure this site publishes and the one worth carrying in your head. Halve the depth and you double the coverage, and the material calculators will work out any other depth and the tonnage with it. That is why a guessed depth wrecks an estimate faster than a mismeasured length does.

What do the ODOT numbers on a quote mean for me as a buyer?

They tell you how the material is specified in Ohio, not who supplied it. ODOT Construction and Material Specifications describe Item 304 as the aggregate base course used under drives, pads and pavement, and Item 411 as a stabilized crushed aggregate, the compacted course Ohio suppliers sell as driveway topping. Clean stone follows ODOT size numbers, which is why you are quoted #57, #8 and #4 rather than inch sizes. Treat the numbers as a shared vocabulary between you, your contractor and the product page. If your job follows an engineering or road-agency spec, compare that spec against the size and grading on the product page you are buying from.

When in the Ohio year is the work best built?

Base, driveway and paver work runs from spring, once the ground has thawed and drained, through to late fall. Frozen or saturated clay will not compact, and a layer rolled into wet till in early March tends to go soft by the time the grass needs cutting. That wait is longest on the flat lake plain in the northwest and in the snowbelt east of Cleveland, and shortest on a sand and gravel knoll or in a valley with outwash under it. Drainage and erosion work is the exception: a scoured ditch bank or a culvert outlet losing ground in the spring storms is worth armoring as soon as you can reach it.

Knowing when to stop and call somebody

When does a job need a professional answer rather than a calculator?

Whenever failure moves something. A retaining wall above a few feet, work inside a stream or ditch bank, anything carrying structural load, a slope in the southeast hills where clayey slope debris slips after long rain, or a drive cut into a hillside above a house: those want a local engineer or contractor who has stood on the ground. A calculator sizes a layer. It cannot see a perched water table or a culvert that has shifted, and neither can a product page.

Choosing between materials that look alike on a screen

What do the fines in 304 and 411 do that #57 limestone cannot?

Fines decide it. Clean stone has none, so water passes straight through and the stone stays loose: that is #57 Limestone, #67 Stone, #8 Crushed Stone, #4 Crushed Stone and Drain Rock, and it is what belongs in a French drain, a trench or a wet corner. Graded material with fines locks together under a roller and carries weight: that is 304 Aggregate Base below and 411 Stone above. Put clean stone under a drive and it rolls under a tire. Put base stone in a drain and it clogs.

Over heavy Ohio clay, does it matter which of the three soils goes where?

No, and using one for another is a common and expensive swap. Fill Dirt is screened subsoil with little organic matter, meant for raising low ground and building a compactable rough grade. Top Soil is screened growing medium for the last few inches under turf or seed, which matters over heavy Ohio clay subsoil. Garden Soil is blended with compost for raised beds and planting areas. Filling a hole with topsoil gives you a soft spot that keeps settling; topping a lawn with fill dirt gives you grass that will not take.

Does Ohio ground change what I should buy?

Constantly. On the northwest lake plain and the wet swales of the till plains, water sits near the surface and the base has to lift the surface clear of it and shed water off a crown, so the depth goes to the deeper end of any range. On the glaciated plateau of the northeast, water perches on a dense subsoil, and a sand and gravel knoll a field away drains freely. In the southeast hills the trouble is speed rather than standing water: runoff scours ditches, so erosion work with RipRap often comes before anything else. Frost reaches roughly 32 inches through much of the state and about 36 inches in parts of the north, with local building departments setting the figure. No base is built that deep, so the work goes into drainage.

Should landscape fabric go under the material?

It is common practice on soft ground, and it addresses one specific problem: stone being pushed down into wet clay until the two mix and the layer loses its shape. On a firm, well-drained subgrade it matters much less. Fabric is not a substitute for fixing drainage or grade, and it will not hold up a base that is too thin for the traffic. It is not a catalogue product here, so source it locally if you decide the site calls for it.

Rounding, an L-shaped drive with a turnaround on the end and working a quantity out from scratch belong to the calculators, which carry the right weight for each of the 24 products. What should be ready on the day, what happens if the truck cannot reach the spot, and what the checkout screen settles sit on the delivery page.

Who operates Ohio Rock Supply?