Gravel Delivery in Maryland

The state geologic map lists sand, gravel, silt and clay at the Baltimore center point. A mix like that is a loose deposit, the kind that moving water spreads out over a long time. Fast water drops pebbles and coarse sand, and slow water lets fine silt and clay settle. One dig in ground like this can turn up a clean sandy layer, then a band of pebbles, then a sticky streak of clay.^[1]

Up at the surface, the USDA soil survey maps gravelly loam at the Baltimore center point and classes it well drained. Gravelly loam is a balanced soil of sand, silt and clay with small stones mixed through it. The stones help water move down, and the well drained class says rain soaks in at a fair pace rather than sitting on top for days. For a buyer, that is a friendly subgrade: it packs firmly, and it does not turn to soup after a storm as quickly as heavy clay would.^[2]

Gravelly loam is still a natural soil, not a base course. Its pebbles are mostly round, and its fine part can soften when soaked. A driveway or a patio on it needs a layer of crushed stone on top, with sharp faces that lock together and spread the weight of a car. Road Base, Crushed Concrete and 3/4" Crushed Stone all do that job. Round products such as Pea Gravel and River Rock are better kept to paths, borders and beds.^[2]

The loose sand and gravel shown on the map also explain why washed sand and round gravel turn up so often in this part of the country. Crushed stone takes an extra step: solid rock is broken in a crusher and then screened by size. That is where the numbered sizes come from. #57 Crushed Stone is a mid-size clean stone, #89 Crushed Stone is a small chip, and #4 Crushed Stone is a large one for the bottom of a deep base.^[1]

The center point of Baltimore stands 90 feet above sea level. This reading marks a single spot on a map. A city lot on a hill can sit much higher, and one in a stream valley lower, so check where water collects on your own ground after a storm before you set the slope of a new drive or patio.^[3]

The Maryland Department of Transportation State Highway Administration calls the stone layer under its pavements Graded Aggregate Base, Section 501, in its Standard Specifications for Construction and Materials (2026). A home project does not have to follow that book. The same idea holds at home: crushed stone graded from coarse pieces down to fines, packed in layers, makes a hard and stable course.^[4]

Rain is the main weather factor for a Baltimore delivery. The weather station used for Baltimore averages 43.7 inches of precipitation a year. That is enough for a lawn to stay damp for a day or two after a soaking storm. Gravelly loam firms up faster than clay, but a fully loaded dump truck still leaves ruts in wet grass, so a paved drop spot is the safer choice after rain.^[2],[5]

Cold days are moderate. The Baltimore station logs 52 days a year at 32 F or colder. Many of those are cold mornings that warm well above freezing by afternoon. A morning drop on frozen ground can be clean and firm, while the same lawn can soften once the sun is up. Stone does not mind the cold, and a pile can wait for a mild day before you spread it.^[5]

City access needs some planning. Rowhouse blocks, narrow alleys and parked cars on both sides of the street can leave a truck little room to back in. A dump bed rises well above the cab to unload, so check for wires, tree limbs and porch roofs over the spot. Where a truck cannot reach the yard, a drop at the curb side of the drive and a few trips with a wheelbarrow may be the way to go.^[3]

Pick the drop spot with the work in mind. Land the pile at the head of the job, uphill if there is a slope, so each load rolls downhill in the barrow. Lay a tarp under the pile on grass to keep fines out of the turf, and keep Topsoil and Compost off light pavers or concrete, which can stain. Tell Gravel Valet about gates, tight turns and soft shoulders when you order.^[2]

Think about runoff from the pile itself. Fines in Road Base and Stone Dust Screenings can wash out in a hard rain and drift onto a sidewalk or into a storm drain. Cover a pile you will not spread the same week, or set it where any runoff flows onto grass. Clean products such as #57 Crushed Stone and Drain Rock shed little and can sit out in the open.^[5]

Driveways and parking pads come first. On the well drained gravelly loam mapped at the Baltimore center point, strip the sod and soft topsoil, then grade and compact the ground below. Fabric is still worth a few minutes on any patch that feels soft. Build the base from Road Base or Crushed Concrete in thin, packed lifts, and finish with 3/4" Crushed Stone or Driveway Gravel. Crown the surface so rain runs to the sides.^[2]

With 52 days a year at 32 F or colder logged at the Baltimore station, a solid base helps a drive ride out freeze and thaw. Water trapped in a fine, dirty base can freeze and lift it. A bottom layer of #4 Crushed Stone on a low or wet site gives that water a path out. Asphalt Millings make another firm surface for a long rural lane or a work yard, and they pack harder as they warm in the sun.^[5]

Drainage projects matter in a city with this much rain. A downspout that empties next to a basement wall can feed a small pit of Drain Rock that spreads the water into the soil. A French drain filled with #57 Crushed Stone around a perforated pipe and wrapped in fabric carries water away from a soggy corner of a yard. At the outlet, a few pieces of Riprap stop it from cutting a channel.^[5]

Garden beds are the other big job. Gravelly loam can be stony at the top, so raise new beds with Topsoil or Garden Soil and work in Compost. Spread Brown Shredded Mulch, Black Shredded Mulch or Wood Chips over the bed to hold moisture through a hot summer. River Rock and Pea Gravel make a lasting cover by a foundation, where mulch would sit against the wall.^[2]

Patios, walkways and play areas use finer products. Pavers want a compacted base of Road Base with a thin bed of Concrete Sand or Stone Dust Screenings to set them level, and Mason Sand swept into the joints. Walkway Gravel and Decomposed Granite pack into a firm garden path. Playground Sand fills a sandbox. Our area calculator turns each layer into tons.^[2]