Gravel, Crushed Stone and Mulch Delivery in Baltimore, MD

Fast-draining soil over layered sands and clays

The USDA soil survey puts the center point of ZIP 21201 in the Urban land-Sassafras complex on 0 to 8 percent slopes. Three quarters of that map unit, 75 percent, is paved or built on. Sassafras, the native soil, makes up 10 percent.^[1]

Where Sassafras soil survives, its top mineral layer is a gravelly loam. It ranks in hydrologic group A, the fastest infiltration class, where water soaks in quickly and little runs off, and the survey rates it well drained. For a gravel project, ground like that does much of the drainage work for you.^[1]

Shrink-swell is low here, a linear extensibility of 1.5 percent through the top 100 cm, so the soil keeps a steady volume between wet and dry spells. A packed base laid on it stays level, and a paver walk set on that base has little reason to crack or tilt from soil movement.^[1]

Under the soil, the geologic map shows the Potomac Group, including Raritan and Patapsco Formations, Arundel Clay, and Patuxent Formation, a Cretaceous group of sand, gravel, silt and clay. Units like these come in alternating beds, so a deep excavation can move from loose sand into sticky clay within a short distance.^[2]

That layering matters for anything dug deep, such as a dry well, a foundation drain or a long trench. A clay bed can stop water that the gravelly loam above lets through, so test a dry well location by digging and filling the hole with water before committing to it.^[1],[2]

The ground at the center point sits 90 feet above sea level on gently sloping terrain.^[3]

Rain and mild winters at the Science Center

The NOAA normals station called MD Sci CTR Baltimore, about 1 mile away, averages 43.7 inches of precipitation a year. Summer thunderstorms can drop heavy rain in an hour, and winter brings cold, soaking storms. Surfaces that shed water fast and beds that soak it up both earn their place.^[4]

The Science Center station records 52 days a year with a low of 32 F or colder. The median date of its last spring freeze is March 24, and the median first fall freeze falls on November 21. Winters are mild enough that frost heave rarely damages a base that drains, though water left standing in a low spot can still freeze and lift stone.^[4]

Heavy summer rain on hot pavement sends warm, fast runoff into yards and alleys. A planted strip or stone border at the edge of a paved area slows that water and lets the gravelly loam beneath take it in.^[1],[4]

Small yards, walks and steps

Most outdoor space in a dense neighborhood is small: a rear yard, a side strip, a courtyard behind a building. On fast-draining gravelly loam, the simplest upgrade is to replace a muddy patch of lawn with an open stone surface that soaks up rain right where it falls.^[1]

For a sitting area, lay fabric over cleared ground, pack a thin base of Road Base, and top it with 3/8" Crushed Stone or Pea Gravel. For a parking pad, use a thicker base of Road Base or Crushed Concrete with Driveway Gravel on top. Edging keeps both from spreading into beds or onto the alley.^[1]

Play areas and dog runs on well-drained ground stay usable through the year. Playground Sand or Wood Chips give a soft landing for children, and Pea Gravel rinses clean in a dog run. A low border keeps each material inside its space.^[1]

Old fill is common where most of the ground has been built on. Before ordering, dig a test hole. If brick, cinders or dark, soft soil turn up, remove them from the footprint of the pad so the base sits on firm ground.^[1]

Slopes on the mapped unit run from 0 to 8 percent, gentle enough for most paths but steep enough in places for loose stone to drift downhill over time. On the steeper stretches, angular 3/8" Crushed Stone or Walkway Gravel holds a tread better than round stone, and timber or stone risers turn a slope into a short flight of gravel steps.^[1]

Each step works best with a packed core of Road Base behind the riser and a thin finish layer on top. Keep the steps pitched slightly forward so rain drains off the tread instead of soaking into it, and use a stiff broom to pull stray stone back after a big storm.^[4]

Choosing between Drain Rock and #57 Crushed Stone for a dry well

A dry well collects roof water underground and lets it seep into the soil. On group A ground, one can take a large share of a storm. The fill stone decides how much water it holds and how long it keeps working.^[1],[4]

Drain Rock is washed, rounded or semi-rounded stone with wide gaps between pieces, so it stores the most water and lets it move freely. #57 Crushed Stone is angular, packs a little tighter and gives the pit firmer sides, which helps where a path or pad will sit on top.^[1]

Either way, line the pit with fabric so soil from the walls cannot wash in and clog the gaps. Set the dry well several steps from the foundation, and dig through any clay layer you hit so the water reaches sandier ground below.^[2]

Soil for planters and raised beds

Gravelly loam drains so freely that it can dry out between summer storms. For raised beds and containers, Garden Soil holds more moisture and food than the native ground. Mixing Compost into existing beds each spring improves the soil's ability to hold water without slowing its drainage.^[1]

Seed and plant tender annuals after the median last spring freeze of March 24 at the Science Center station. Late plantings have a long run before the median first fall freeze of November 21, so fall is a good season for shrubs and perennials too.^[4]

Cover every bed with mulch. Black Shredded Mulch or Brown Shredded Mulch keeps the soil cool and weed-free, and Wood Chips make a soft path between beds that soaks up rain instead of turning to mud.^[4]

Housing in ZIP 21201

The Census counts 12,185 housing units in ZIP 21201. Detached single-family houses are 2 percent of them, and the median home dates from 1967. Owner-occupied homes make up 11 percent of the occupied total.^[5]

Baltimore city has 295,032 housing units. Detached houses account for 15 percent of the citywide stock, and the median year built is 1947.^[5]

The Maryland Department of Transportation describes the stone course under its roads as Graded Aggregate Base, Section 501, in its Standard Specifications for Construction and Materials (2026).^[6]