MnDOT standard riprap gradations
Link to this table
| Weight | Size | Approximate Percent of Total Weight Smaller than Given Weight | ||||||
|---|---|---|---|---|---|---|---|---|
| lb | kg | in | mm | Riprap Class | ||||
| I | II | III | IV | V | ||||
| 2,000 | 900 | 30 | 750 | - | - | - | - | 100 |
| 1,000 | 450 | 24 | 600 | - | - | - | 100 | - |
| 650 | 300 | 21 | 525 | - | - | - | - | 75 |
| 400 | 180 | 18 | 450 | - | - | 100 | - | - |
| 250 | 113 | 15 | 375 | - | - | - | 75 | 50 |
| 120 | 55 | 12 | 300 | - | 100 | 75 | 50 | - |
| 50 | 22 | 9 | 225 | - | 75 | 50 | - | - |
| 15 | 7 | 6 | 150 | 100 | 50 | - | - | 10 |
| 5 | 2 | 4 | 100 | - | - | - | 10 | - |
| 2 | 1 | 3 | 75 | 50 | - | 10 | - | - |
| - | - | 2 | 50 | - | 10 | - | - | - |
| - | - | 1 | 25 | 10 | - | - | - | - |