ResultRiver Rock Vs Rip Rap - Just Yardz. In such cases, excavation may be necessary. R5 rip rap is usually smaller than river rock, with an average length of nine to 18 inches. R6 is larger, at 12 to 24 inches. R5 and R6 are commonly used and offer the most versatility. They are mid-size and heavy, but are both good for reinforcing …
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