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Riprap is large mixed-size rock used for streambank reinforcement, outfalls, and lining slopes. Riprap is graded by the size of the largest 20 percent of the rock. For example, the largest 20% of class 100 will weigh an average of 80 to 100 pounds. Riprap will contain all sizes if rock down to fines.
Dalton Rock is a Oregon Department of Transportation (ODOT) approved Riprap source
We grade our riprap according to the 1991 Oregon Standard Specifications for Highway Construction

Class 50

Class 100

Class 200

Class 700

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Updated 18-Mar-05 -jwk-