If you're laying a dry creek bed, edging beds with decorative stone, or building drainage features, knowing what a cubic yard of river rock actually weighs determines your delivery, equipment, and load planning. This guide breaks down river rock weight and how to calculate it.
What Is River Rock?
River rock is naturally smooth, rounded stone shaped by years of water-tumbling in river and stream beds. The rounded shape and smooth surface make it the go-to decorative landscape stone — it looks natural in dry creek beds, garden borders, around water features, and as accent ground cover. Common sizes range from ¼" (small accent) up to 2-3" (statement landscape stone).
What Affects the Weight of River Rock?
1. Stone Size
Larger river rock weighs less per cubic yard than smaller because the rounded shapes leave more air gap between stones at large sizes. ¼" packs tighter and weighs more per yard than 2-3" stone of the same source.
2. Source Region
River rock from granite-rich watersheds (most New England river rock) weighs more than rock from limestone or sandstone watersheds. Most East Coast river rock weighs ~2,500 lbs/cy.
3. Moisture
Wet river rock weighs ~5% more than dry. Moderate effect compared to mulch or compost.
Average River Rock Weight Per Cubic Yard
On average, river rock weighs about 2,400 to 2,700 pounds per cubic yard. Small-format ¼" sits at the higher end (~2,700 lbs/cy); large statement 2-3" at the lower end (~2,400 lbs/cy).
Quick reference for our most popular Boston-area river rock:
- Riverbed Rock ¼": ~2,700 lbs/cy
- Riverbed Rock ¾": ~2,600 lbs/cy
- Riverbed Rock 1.5": ~2,500 lbs/cy
- Creek Rock 2"-3": ~2,400 lbs/cy
How to Calculate River Rock Weight
To estimate the total weight for your project:
- Volume needed (in cubic yards)
- Estimated weight per yard (~2,500 lbs as a working average)
Then multiply:Cubic Yards x Weight per Cubic Yard = Total Weight (lbs)
Example:
For a 30' x 4' dry creek bed at 4" of river rock depth, you need about 1.5 cubic yards. At ~2,500 lbs/yard:1.5 x 2,500 = 3,750 lbs (about 1.9 tons)
Coverage: 1 cubic yard of river rock covers about 100 sq ft at 3" depth, or 80 sq ft at 4" depth.
Where to Buy River Rock in Greater Boston
For fast bulk river rock delivery across the Greater Boston area, Ottr Landscape Supply carries the full size range — ¼", ¾", 1.5", and 2-3" creek rock — all delivered loose by the cubic yard.
No minimum order, same-day and next-day delivery across Suffolk, Middlesex, Norfolk, and Plymouth County.
Get a Quote or Order River Rock Online Today
Browse our decorative stone collection for the full lineup of river rock and decorative landscape stone.
