Gravel, Stone and Soil for Centre County, PA
Pennsylvania Rock Supply handles gravel, stone and aggregate delivery in Centre County, PA. The base stone most jobs here start with is 2A modified, also called modified stone. It is crushed stone with the fines left in, so it compacts hard under a driveway, a parking pad, or a shed base. Centre County ground runs from folded sandstone ridges to clay-floored valleys, and that mix decides how deep a base needs to go.
Delivery across Centre County
You order online and pick a delivery date at checkout. Size the load by the ton or by the yard, and use the calculator if you need help with the amount. A dump truck then delivers to your site.
Delivery covers State College, Bellefonte, Boalsburg, Philipsburg, Centre Hall, Clarence, Snow Shoe, Howard, Aaronsburg, Millheim, Port Matilda, Rebersburg, Spring Mills and Julian. If your site sits on a hillside or a narrow valley road, note that at checkout so the truck can place the pile where you want it.
Materials delivered in Centre County
Local yards still say 2B for #57 and 1B for #8. Here is how the sizes stack up, coarsest to finest.
2A modified is the trade name for a 2A-type base with extra fines added. That is how it is specified and sold locally. It is the stone most Centre County drives, pads and patio bases are built on.
For drainage, 2B or #57 is the usual pick because water passes straight through. Below that, #89 Crushed Stone and 3/8" Crushed Stone handle tight bedding and fine topping. For lawns and beds, Top Soil and Shredded Mulch finish the job.
Ground conditions across Centre County
Centre County spans more than one ground zone, so conditions change as you move across it. Around State College, Bellefonte, Boalsburg and Centre Hall, folded bedrock leaves long sandstone ridges with thin, stony soils. Valleys are floored by shale or by limestone and dolomite that weather to clay.
In the limestone and dolomite valleys, runoff concentrated from roofs, gutters and drives can open sinkholes. Route that water away from the house and into clean stone, not into bare clay. In the anthracite coal fields, old strip mines and waste piles break up the ground.
Out toward Clarence, Snow Shoe and Moshannon, shale, siltstone and coal beds have weathered into silty, clay-rich soils on hilly ground. Water soaking into clay layers on slopes is the main landslide trigger, so where roof and drive runoff is sent matters on hillside lots. Near Philipsburg and Orviston, thin stony soils sit on broad uplands cut by deep valleys, and rain runs fast off the steep sides into ditches, culverts and low drives.
Base, driveway and paver work runs from spring, once the ground has thawed and dried, into late fall. Base stone should not go down on frozen, soft or muddy ground. Cold winters bring repeated freeze-thaw cycles that heave and break up a thin base or one that holds water. Frost depth is commonly about 36 inches, set by each municipality.
Choosing the right material
Clearfield County sits in North Central Pennsylvania and spans the plateau hills and the high plateau zone, so its ground is much like Centre County's western side. The same 2A modified base and clean drainage stone carry over.
Blair and Huntingdon counties share Centre County's Ridge and Valley ground, with folded bedrock, thin stony soils on the ridges, and clay-floored valleys. The material choice is similar there, so the difference is usually the project rather than the ground.
Across all three, start with 2A modified for anything that takes weight. Add 2B or #57 where water has to move. Use RipRap where runoff scours a ditch, culvert outlet or stream bank. On clay-rich slopes, send roof and drive water into clean stone before it soaks in.
Order gravel, stone and soil in Centre County
Pennsylvania Rock Supply delivers 2A modified, clean drainage stone, sand, topsoil and mulch across Centre County, from State College and Bellefonte to Philipsburg, Snow Shoe and Millheim. Order online, size the load with the calculator, and pick your delivery date at checkout.