Washington River Rock
Also sold as River Rock
Also known as: round rock, river cobble
Washington River Rock brings a water-worn look to visible planting areas and drainage details while keeping the landscape finish natural.
- Size: 1 inch to 3 inches
- Type: Smooth, naturally rounded stones
- Color: Tans, grays, browns and occasional reds
From $806 for 1 ton, delivery included (larger loads cost significantly less per ton)
Free delivery included
Free delivery anywhere in Washington
Pick a delivery date
Weekday delivery, earliest Nov 3
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Everything You Need to Know About Washington River Rock
Size and Grading
- Size
- 1 inch to 3 inches
- Type
- Smooth, naturally rounded stones
- Color
- Tans, grays, browns and occasional reds
Choosing Washington River Rock for a buried layer can hide the part of the material that makes it useful. The smooth, rounded stones are best suited to landscape areas meant to remain visible, including decorative drainage routes, planted ground cover, and water-feature borders. Their water-worn surface and earth-toned variation create a natural transition between plants, hardscape, and open ground.
West of the Cascades, rain can sit above hardpan and leave landscape surfaces wet after a storm. Use River Rock as the finished cover once the intended drainage route has been planned, particularly where runoff needs a clear path through a visible area. The stone can help protect exposed soil from erosion while giving the route a settled appearance. In drier parts of the state, it also provides a lasting decorative surface around planting zones without the breakdown associated with organic mulch.
Quickly Calculate How Much You Need
Material: Washington River Rock
How to Measure
Measure the length and width of your project area in feet
Decide on depth in inches (2" for landscaping, 4" for driveways)
Enter the values above and we'll calculate the tonnage you need
Need help figuring out the right amount? We can help!
Call or text us at (206) 582-6792 and we'll help you calculate the right quantity for your project.
Not sure how much you need? The River Rock Calculator has depth guides, coverage charts and worked examples for this material.
Common Uses
Landscape Uses
Set river rock at tree rings, fence lines, flower beds, and garden edges for a defined finish. It works as non-organic ground cover and adds contrast around planted areas.
Drainage Work
Water moves readily through rounded river rock. Use it in French drains through hardpan, swales, downspout runs, and dry channels to control erosion and move water away from buildings or wet spots.
Water Features & Ponds
Set river rock around pond edges, beneath fountains, and through waterfall runs. The rounded stones and mixed natural color help these water areas look at home in the landscape.
Finishing Details
River rock suits path edging, rock gardens, and low-water planting areas. Combine it with paving, individual walking stones, and regional plants to tie the layout together.
Why Choose Washington River Rock
Durability
Organic mulch breaks down, but river rock does not decompose or fade in the same way. Once it is placed, the stone can stay in service for decades without replacement.
Simple Upkeep
Wood mulch often needs a yearly top-up; river rock does not. A rinse from the hose now and then clears off dirt and keeps the surface clean.
Natural Material
River rock contains no added dyes or preservatives to wash into the ground. It allows water to pass through and can reduce watering needs in xeriscape layouts.
Natural Appearance
Rounded surfaces and mixed natural tones give river rock a finished look in many landscape styles. It fits both contemporary and traditional yards.
