River Rock in Virginia: Stone Cover for Beds That Keep Washing Out

The decision that brings most people to this page is not really about stone. It is about whether to buy mulch for the fourth year running for a bed that empties itself down the drive every time a summer thunderstorm parks over the house. On slow-draining Piedmont clay and on flat, low coastal lots, that is a common annual expense. River Rock is the alternative, and it is the right call in some of those beds and the wrong one in others.

The bed that empties itself every time a thunderstorm sits still

Shredded bark floats. Water running off a roof, across a clay slope or along a compacted path picks it up and carries it, and what is left behind is bare soil and a tide line of mulch against the curb. Rounded stone at 1 to 3 inches is heavy enough to stay in place under that kind of flow, and it does not rot, fade to gray or need replacing on a schedule.

What it does not do is fix the water. A stone bed laid over a route water was already taking will simply be a stone bed that water runs through. Shape the route first and the stone lasts; skip that and you will be raking it back into place after every storm regardless of how heavy the pieces are.

The stone is naturally rounded and smooth, in tans, grays, browns and the occasional red, which is why it reads as landscape rather than as construction material.

How rounded 1 to 3 inch stone sits on clay, on sand and on a slope

Ground decides how much preparation is worth doing.

• Piedmont clay sheds water fast in a storm and holds it afterwards. Stone laid straight onto bare clay gets pressed into it under foot traffic and gradually disappears, so a separation layer earns its cost there.
• Coastal Plain sand and low ground through Hampton Roads, the Eastern Shore and the river necks has the opposite problem: the sand migrates up into the stone and the bed slowly turns into gravelly soil with weeds in it.
• A slope is where rounded stone shows its one real weakness. Angular material keys together; rounded material does not. Anything more than a gentle fall needs the stone contained at the bottom or stepped rather than run continuously.
• Freeze-thaw, moderate across the Piedmont and heavier in the Blue Ridge and the western mountains, lifts and shuffles a stone bed through its first winter. This is normal and it settles.

Three places it is the wrong answer, despite frequently being asked about: inside raised vegetable beds, where it takes up root volume and heats the soil; as a playground surface, where rounded 1 to 3 inch stone is neither comfortable nor appropriate underfoot; and as the surface of an RV or boat parking pad, where rounded pieces roll away under tires instead of locking up. For the paths between raised beds, the border strip around a play area and the scour strip beside a parking pad, it works well.

Shaping the route first, then fabric, then stone

Order matters more than effort here.

1. Set the grade. If the bed is carrying water, cut the channel or the swale to shape and give it a fall to somewhere sensible before any stone arrives.
2. Excavate to depth. Stone laid on top of existing grade ends up proud of the lawn and migrating into it; stone laid into a shallow excavation stays put.
3. Lay a separation fabric over the shaped ground. It keeps soil from working up into the stone and slows, without stopping, weed growth from below.
4. Set the edge before the stone, not after. Steel, aluminum, timber or a paver curb all work, and the edge should stand slightly proud of the finished stone level.
5. Place the stone and rake it to an even depth, leaving it a little below the edge so it has somewhere to settle into.

Where a downspout discharges into the bed, carry the stone right up under the outlet and make the receiving area wider than you think it needs to be.

Rinsing, leaf litter and the first year after installation

Stone beds are lower maintenance than mulch, not no maintenance, and the first twelve months are the ones that set expectations.

• The color deepens noticeably when wet and dulls as dust and pollen settle on it through spring. A hose rinse brings it back.
• Leaves and pine needles collect in the gaps and break down there. A leaf blower on a low setting clears them; a rake moves the stone.
• Weeds arrive from above rather than from below, seeding into the organic material that collects between the pieces. Clearing the litter is what keeps them down.
• The bed settles through its first freeze and thaw cycle and again after the first heavy storms, so keep a little stone back for topping up.
• Stone that migrates into the lawn is an edging problem, not a stone problem.

Yardage for a 22 foot dry creek line and two bed borders

Square feet times depth in inches divided by 12 gives cubic feet. Divide by 27 for cubic yards.

• Example, a dry creek line 22 ft long and 4 ft wide at 3 inches: 88 square feet x 0.25 = 22 cubic feet. 22 / 27 = 0.8 cubic yards.
• Example, two bed borders 18 inches wide and 34 ft long, at 3 inches: 1.5 x 34 = 51 square feet each, 102 square feet total. 102 x 0.25 = 25.5 cubic feet. 25.5 / 27 = 0.9 cubic yards.
• Example, a border strip 2 ft wide and 40 ft long around a play area, at 3 inches: 80 square feet x 0.25 = 20 cubic feet. 20 / 27 = 0.7 cubic yards.

This site publishes roughly 2,700 lb per cubic yard for 1 to 3 inch river rock, about 1.35 tons per yard, and that weight is approximate: the dry creek line above is 0.8 x 1.35 = roughly 1.1 tons, with the pair of bed borders about 1.2 tons and the play area strip about 0.9 tons.

At 1 to 3 inches, a layer much under 3 inches will not cover the ground properly, since a single large piece is most of that depth on its own. The river rock calculator converts cubic yards into tons for this material.

Pick a quantity and a date on this page once the edging is in and the fabric is down, so the load goes straight into a finished bed rather than into a heap on the drive. Delivery is arranged at checkout from your ZIP code.