Fill Dirt in Maryland: The Load That Fixes Elevation, Not Growth

The job that brings most people to fill dirt on a Maryland lot is a corner of the yard that holds water. On the flat Coastal Plain ground of Anne Arundel, Charles or the Eastern Shore, the water table can sit within a foot or two of the surface, and a low spot there stays soft for weeks after a nor'easter. Piedmont lots have their own version: silty ground at the bottom of a slope where everything the yard sheds ends up. In both cases the problem is elevation, and elevation is what this material is sold to change.

Size: screened to remove large rocks, roots and debris. Grading: minimal organic matter.

Fill dirt against screened topsoil, garden soil and a load of base stone

Four bulk materials on the same order form look alike on a delivery ticket and behave nothing like each other in the ground.

Those are this site's own published figures and they are approximate. Two of them matter more than the rest. The wet-weight line is why a spring order runs heavier on the ticket than the same volume delivered in August. And the gap between fill dirt and topsoil is the whole decision: minimal organic matter means very little to decompose and therefore very little later settlement, which is exactly what you want under a grade and exactly what you do not want under a lawn.

The low corner, the pool that went, and the trench that has to close

• Bringing up a spot where water gathers so runoff leaves toward a swale or a drain instead of pooling against the house or the patio.
• Backfill around foundation walls, retaining walls and other below-grade structures, where a soil that breaks down would leave a hollow in two years.
• Filling a former pool, an old basement, an excavation gap or a large depression, then compacting it to take whatever is going on top.
• Setting site elevations before a pad, a drive or a slab is built, and shaping the fall those need.

On the Eastern Shore and the lower Western Shore, remember what the fill is standing on. Raising a pad above wet ground works. Trying to dry the ground out by burying it does not.

Six-inch lifts, the settlement to expect, and what finishes the surface

Fill goes in in layers, not in one heap. Spread roughly six inches at a time, compact each lift before the next arrives, and keep the moisture sensible: bone dry material will not bind and saturated material will not compact at all. A deep dump left to settle on its own is the single most common reason a filled area drops over its first winter.

Then plan the finish separately. Fill dirt sets the shape; it is not a rooting medium. Grass and plants want a layer of Top Soil over the compacted fill, and a raised bed wants Garden Soil rather than either. Where the surface will carry a car instead of a lawn, the fill is subgrade and the load-bearing layer goes on top of it.

Expect some settlement even with careful lifts, particularly through the first freeze-thaw winter. Frost runs to about 30 inches through most of the state, 24 inches in several Eastern Shore counties and 36 inches in Garrett County, and repeated freezing works on newly placed ground. Leaving a filled area slightly proud of final grade and topping it in the spring is normal practice rather than a mistake.

Tons for a rural lane subgrade, a raised garden path and a lawn regrade

Square feet times depth in feet, divided by 27, gives cubic yards. Multiply by 1.20 for tons at the dry figure, or up to 1.50 if the material is wet. These are worked examples, not real projects.

• Example, a long rural lane, 280 feet by 10 feet, brought up 6 inches before base stone goes down: 2,800 square feet x 0.5 = 1,400 cubic feet, divided by 27 = 51.9 cubic yards. That is roughly 62 tons dry, and up to about 78 tons if it arrives wet. The lane surface is a separate order, since fill dirt will not carry a tire.
• Example, a garden path raised out of a wet strip, 48 feet by 3 feet, lifted 8 inches: 144 square feet x 0.6667 = 96 cubic feet, divided by 27 = 3.56 cubic yards, about 4.3 tons. The walking surface then goes on top, with Walkway Gravel the usual choice.
• Example, new lawn prep over a low area 22 feet by 34 feet, or 748 square feet. Four inches of fill to correct the grade is 748 x 0.3333 = 249 cubic feet, divided by 27 = 9.23 cubic yards, about 11.1 tons. Three inches of topsoil over the top is 748 x 0.25 = 187 cubic feet, 6.93 cubic yards, about 7.6 tons at 1.10 tons per cubic yard. Two materials, two figures, one afternoon of measuring.

Check your own numbers in the dirt calculator, then set a quantity and a delivery date here. Dirt is heavy and the drop spot decides how much of the weekend you spend with a wheelbarrow, so pick it before the truck is booked. Maryland Rock Supply arranges delivery at checkout by ZIP code, and the driver needs clear access to somewhere the load can be tipped.