Cobbles or oversize are larger “river rock.” They are used primarily for landscaping to create the look of a dried river bed or to border a flower bed or planting strip.
1½” drain rock is the most common size of drainage gravel. It can be used for in drain systems, septic systems, French drain, landscaping gravel, or as river rock in a dry river bed.
¾” drain rock or ⅞” drain rock is similar to the inch and a half gravel.
Pea gravel is ⅜”. It is similar to pipe bedding, which we also carry.
Contact us to request more information about our Seattle river rock and washed gravel deliveries.