Gravel Delivery in Michigan

Layers of old sea floor sit deep under our Michigan cities, and the geologic map names them. It lists limestone and dolostone at the Detroit and Dearborn center points. Grand Rapids shows a longer list: limestone, sandstone, dolostone, shale, chert and evaporite. Warren reads black shale and limestone, and Sterling Heights reads sandstone and siltstone.^[1]

Limestone and dolostone are the rocks most often crushed into stone for driveways and bases. They break into blocky pieces with sharp corners, and those pieces lock together when packed. Shale is softer and splits into thin flakes, so it is a poor choice for a base. For a buyer, the useful part is knowing what to ask for: hard crushed stone such as #57 Crushed Stone or 3/4" Crushed Stone for anything that carries weight.^[1]

The soil on top of that rock varies a lot. The USDA soil survey maps sand at the Grand Rapids center point and sandy loam at Detroit and Dearborn, all three well drained. Sterling Heights reads loam, classed somewhat poorly drained. Warren reads silty clay loam, classed poorly drained, the heaviest and wettest ground of the five.^[2]

Those readings split the cities into two kinds of job. On the sand at the Grand Rapids center point and the sandy loam at Detroit and Dearborn, water drains fast and the ground packs firmly once it is confined. On the poorly drained silty clay loam at Warren and the somewhat poorly drained loam at Sterling Heights, water stays near the top, and a stone base needs fabric under it and a way for water to escape.^[2]

The center points sit at similar heights. Grand Rapids stands 700 feet above sea level, Sterling Heights 630 feet, Detroit and Warren 620 feet each, and Dearborn 580 feet. Each reading belongs to one spot on a map. On flat ground, a dip of a few inches can be enough to hold a puddle, so watch your own lot after a thaw before you set a grade.^[3]

Cold shapes the calendar. The weather station used for Grand Rapids logs 143 days a year at 32 F or colder, and the Sterling Heights station 135 days. Dearborn's station logs 125 days, and the stations for Detroit and Warren each log 112 days. Plenty of those days climb above freezing by afternoon, and the freeze and thaw that follows works water in and out of the top of the ground.^[4]

Snow is heavy on the west side. The Grand Rapids station averages 74.9 inches of snowfall a year, while the Sterling Heights station averages 36.0 inches. Before a winter load comes, clear the drop spot and the path to it, and push snow banks back so the truck has room to swing. Stake the edges of the drive, since a buried curb or flower bed is hard for a driver to see.^[4]

Spring thaw is the soft season, above all on heavy ground. Poorly drained silty clay loam, as at the Warren center point, can stay soft well after the frost leaves, and a loaded truck can sink into it. Plan a spring drop on pavement or a firm gravel apron there. Sandy ground like the Grand Rapids reading firms up much sooner.^[2]

Rain totals are moderate. The Grand Rapids station averages 39.6 inches of precipitation a year, Dearborn's 34.9 inches and Sterling Heights' 33.9 inches. The stations for Detroit and Warren each read 29.9 inches. Most of the wet trouble here comes from snowmelt sitting on cold, slow ground rather than from big summer storms.^[4]

Look up and around before the truck arrives. A dump bed rises high to unload, so overhead wires and low limbs matter. Narrow drives between houses, tight cul-de-sacs and soft lawn edges can limit where it can reach. Lay a tarp under the pile on grass, and tell Gravel Valet about anything in the way when you order.^[3]

Frost-proof driveways come first. With 143 days a year at 32 F or colder at the Grand Rapids station, a thin base heaves and ruts. Dig down to firm ground, lay fabric on anything finer than sand, and build a deep course of Road Base or Crushed Concrete in packed lifts. Finish with Driveway Gravel or 3/4" Crushed Stone, and crown the surface so melt runs off the sides.^[4]

Heavy ground needs extra drainage under the drive. On poorly drained silty clay loam like the Warren reading, put a layer of #4 Crushed Stone or 1-1/2" Crushed Gravel at the bottom of the base so trapped water can move out before it freezes. A shallow ditch or a buried pipe along the low side of the drive, bedded in Drain Rock, carries that water away.^[2]

French drains and window wells are common jobs. On somewhat poorly drained loam like the Sterling Heights reading, a trench lined with fabric and filled with #57 Crushed Stone around a perforated pipe pulls water away from a basement wall. Window wells drain better with a few inches of clean Pea Gravel or #57 Crushed Stone at the bottom. Riprap holds the outlet of a ditch where spring melt runs fast.^[2]

Parking pads and shed bases follow the same rules on a smaller scale. On the sand at the Grand Rapids center point, a framed pad of 3/4" Crushed Stone drains on its own and needs little more than a packed base. On the silty clay loam at Warren, lay fabric first and add a coarse layer under the pad, or the clay will pump up into the stone each spring and leave the surface soft.^[2]

Gardens on sand need help holding water. The sand at the Grand Rapids center point and the sandy loam at Detroit and Dearborn drain quickly, so mix Compost and Garden Soil into new beds. Top them with Brown Shredded Mulch or Black Shredded Mulch to hold moisture and protect roots through hard freezes. On heavier ground, raise beds with Topsoil so roots sit above wet soil.^[2]

Patios and walks finish the list. Pavers need a compacted base of Road Base and a thin bed of Concrete Sand to set them level. Stone Dust Screenings make a firm setting bed for flagstone. Walkway Gravel and Decomposed Granite pack into a firm garden path, and Playground Sand fills a sandbox. Set paver bases a little deeper than you would in a warm state, since frost pushes hardest on thin layers. Our area calculator turns each layer into tons.^[2]