Crushed Stone, Gravel and Soil Delivery in Knoxville, TN

Pavement Over Ancient Dolomite

Downtown ground is mostly covered. The USDA soil survey maps the center point of ZIP 37902 as Urban land, and the survey counts 90 percent of that map unit as paved or built over. Whatever soil remains has been cut, filled and packed many times.^[1]

Beneath it lies the Copper Ridge Dolomite, a Cambrian unit of dolostone and chert. Dolostone is a hard carbonate rock, and the chert it carries breaks into sharp, durable pieces. That kind of rock can dissolve slowly along cracks over long spans of time, which is one reason water may vanish quickly in one spot and pond in another.^[2]

The USGS elevation service reads the ground at the center point as 910 feet above sea level. Chert from carbonate rock like this breaks into hard, sharp-edged fragments, and anyone digging a footing or a trench on an old lot here may hit pieces of it mixed into the fill.^[2],[3]

Wet Months and a Real Frost Season

The NOAA normals station called Knoxville Exp STN, TN, about 5 miles away, averages 55.8 inches of precipitation a year. That is a lot of water to move off a driveway or out of a bed.^[4]

Frost is a steady visitor too. The station counts 87 days a year when the low reaches 32 F or lower. Its median last spring freeze comes on April 11. The median first fall freeze there arrives on October 28.^[4]

Late cold also shapes the planting calendar. A median last spring freeze in mid April means tender annuals and vegetable starts are safer waiting until the second half of that month, while spring bulbs and cool-season greens can go in sooner.^[4]

Plenty of rain plus many freezing nights is the classic recipe for frost heave and potholes. Water that soaks into a base and then freezes expands and pushes stone apart. A drive that sheds water fast and drains from below holds together far better through a Knoxville winter.^[4]

Building a Base That Survives Freeze and Thaw

Start any drive or parking pad by digging out loose fill and soft spots until the shovel meets firm ground. On urban land, old brick, ash or construction debris may turn up, and it is better removed than buried under new stone.^[1]

Lay fabric if the subgrade feels soft, then build the base with Road Base in thin, compacted lifts. The fines in Road Base fill the gaps between larger stones and bind the layer tight. Finish with #57 Crushed Stone or 3/4" Crushed Stone, which drains through and resists the push of frost better than a dense, fine surface.^[4]

Shape the top with a crown and keep the edges open so water leaves quickly. Tennessee's transportation department names its own base layer Mineral Aggregate Base, Type A, under Section 303 of its Standard Specifications for Road and Bridge Construction (April 1, 2026).^[4],[5]

Small Spaces, Planters and Courtyards

With so much of the center point paved, many projects here are compact. Raised planters, tree wells and courtyard beds need a soil that drains but still holds water. Garden Soil fills a planter box well. For larger beds, mix Topsoil with Compost.^[1]

Plant after the median last spring freeze of April 11 to keep tender growth safe. A layer of Black Shredded Mulch or Brown Shredded Mulch keeps soil moist through summer and cushions it against cold in late fall.^[4]

For decorative cover in a courtyard, River Rock and Pea Gravel both look clean. Decomposed Granite packs into a firm, walkable surface for a seating nook.^[1]

Choosing Between #57 and #89 Stone

#57 Crushed Stone and #89 Crushed Stone are clean stones with no fines, so each drains freely. The difference is size. #57 Crushed Stone has larger pieces that lock into a stable layer and move water fast, which makes it the usual pick for driveway tops, drain trenches and the bottom of a wall backfill.^[4]

#89 Crushed Stone is much smaller. It fills tight spaces, sits smoothly under pavers or a shed floor and makes a neat path surface. It moves water too, but it can shift more under heavy wheels. On a frosty site like this one, the bigger stone is the safer choice for anything that carries a car.^[4]

A third option sits in the middle. #67 Stone runs a little smaller than #57 and packs a touch tighter, which some people prefer for a walkable driveway top or a base under a garden shed. Mixing sizes in one layer is rarely worth it, though. Each stone drains best when it is kept clean and graded, with the larger size below and the smaller one above.^[4]

Backfill and Drains for Walls and Foundations

Retaining walls and basement walls both suffer when water builds up behind them. In a city that averages 55.8 inches of precipitation a year at the nearby station, the backfill behind a wall should be clean stone, never the native soil dug from the trench. #57 Crushed Stone works well for this. Water drops through it to a perforated pipe at the base and drains away instead of pressing on the wall.^[4]

Frost adds a second reason. Wet soil behind a wall freezes and swells, and over many winters that push can tilt blocks out of line. Clean stone holds little water, so there is little to freeze. Wrap the stone in filter fabric where it meets soil, so fines do not wash in and clog it over the years.^[4]

Footing drains, window wells and the gravel bed under a crawl space follow the same rule. Use clean, angular stone, give the water a way out at the low end, and keep soil out of the stone.^[4]

Paths, Patios and Steps

A patio on downtown fill needs a firm start. Dig to solid ground, compact it, lay fabric if needed, then build a layer of Road Base. Set pavers on a thin bed of Concrete Sand or #89 Crushed Stone, and give the patio a slight fall so water leaves it. With 87 freezing days a year at the gauge, a well-drained base is what keeps pavers from rocking loose by spring.^[1],[4]

For a simple path, Walkway Gravel or Stone Dust Screenings over a shallow base make a firm, even surface. Timber or stone steps set into a bank can be backed with #57 Crushed Stone so rain drains out from behind each tread.^[4]

Homes in ZIP 37902

The Census Bureau counts 1,983 housing units in ZIP 37902. Just 1 percent of them are detached single-family houses. The median home in the ZIP dates to 1962, and owners occupy 19 percent of the lived-in homes.^[6]

Knoxville as a whole has 96,441 housing units, 52 percent of them detached houses, with a citywide median build year of 1974.^[6]