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Source: Caltran Highway Design Manual, Chapter 870
These supersede the previous Caltrans Riprap Sizes.

Caltrans requires the use of these new RSP gradations starting August 1st, 2016 in new projects and those not yet at 30 percent PS&E stage.

Caltrans Highway Design Manual Table 873.3A

RSP Class by Median Particle Size(3)
Nominal RSP Class by Median Particle Size(3) d15 d50 d100 Placement
Class (1), (2) Size (in) Min Max Min Max Max Method
I 6 3.7 5.2 5.7 6.9 12.0 B
II 9 5.5 7.8 8.5 10.5 18.0 B
III 12 7.3 10.5 11.5 14.0 24.0 B
IV 15 9.2 13.0 14.5 17.5 30.0 B
V 18 11.0 15.5 17.0 20.5 36.0 B
VI 21 13.0 18.5 20.0 24.0 42.0 A or B
VII 24 14.5 21.0 23.0 27.5 48.0 A or B
VIII 30 18.5 26.0 28.5 34.5 48.0 A or B
IX 36 22.0 31.5 34.0 41.5 52.8 A
X 42 25.5 36.5 40.0 48.5 60.5 A
XI 46 28.0 39.4 43.7 53.1 66.6 A

NOTES:

  1. Rock grading and quality requirements per Standard Specifications.

  2. RSP-fabric Type of geotextile and quality requirements per Section 96 Rock Slope Protection Fabric of the Standard Specifications. For RSP Classes I thru VIII, use Class 8 RSP-fabric which has lower weight per unit area and it also has lower toughness (tensile x elongation, both at break) than Class 10 RSP-fabric. For RSP Classes IX thru XI, use Class 10 RSP-fabric.

  3. Intermediate, or B dimension (i.e., width) where A dimension is length, and C dimension is thickness.

Caltrans Highway Design Manual Table 873.3B

RSP Class by Median Particle Weight(3)

Nominal RSP Class by Median Particle Weight W15 W50 W100 Placement
Class (1), (2) Weight Min Max Min Max Max Method
I 20 lb 4 11 15 27 140 B
II 60 lb 14 39 50 94 470 B
III 150 lb 32 94 120 220 1,100 B
IV 300 lb 63 180 250 440 2,200 B
V 1/4 ton 110 300 400 700 3,800 B
VI 3/8 ton 180 520 650 1,100 6,000 A or B
VII 1/2 ton 250 750 1000 1,700 9,000 A or B
VIII 1 ton 520 1,450 1,900 3,300 9,000 A or B
IX 2 ton 870 2,500 3,200 5,800 12,000 A
X 3 ton 1,350 4,000 5,200 9,300 18,000 A
XI 4 ton 1,800 5,000 6,800 12,200 24,000 A

NOTES:

  1. Rock grading and quality requirements per Standard Specifications.
  2. RSP-fabric Type of geotextile and quality requirements per Section 96 Rock Slope Protection Fabric of the Standard Specifications. For RSP Classes I thru VIII, use Class 8 RSP-fabric which has lower weight per unit area and it also has lower toughness (tensile x elongation, both at break) than Class 10 RSP-fabric. For RSP Classes IX thru XI, use Class 10 RSP-fabric.
  3. Values shown are based on Table 873.3A dimensions and an assumed specific gravity of 2.65. Weight will vary based on density of rock available for the project.

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