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 - - - -

This page was last modified on 11 March 2019, at 11:06.

Minnesota Pollution Control Agency | 651-296-6300, 800-657-3864 | Assistance | Web site policy