856.1DESCRIPTION—This work is construction, maintenance, and removal of a rock barrier for channel
and slope protection.
856.2MATERIAL—
(a)Rock, Class R-4. Section 850.2(a), except petrographic examination by the LTS is not required.
(b)Coarse Aggregate, No. 57. Section 703.2
856.3CONSTRUCTION—As shown on the Standard Drawings and as follows:
(a)Installation. Determine the required dimensions of the rock barrier. Produce an even distribution of
rock with minimum voids. Provide a 12-inch layer of coarse aggregate on the uphill side of the barrier.
(b)Maintenance. Inspect the rock barrier weekly and after each runoff event throughout the duration
of the project. If needed, immediately repair any damaged areas of the rock barrier found during inspection. Remove sediment when accumulations reach half the height of the barrier. Remove and dispose of sediment in an approved manner.
(c)Remove sediment and rock barrier upon stabilization of each channel as indicated.
856.4MEASUREMENT AND PAYMENT—
(a)Rock. Square Yard or Cubic Yard
(b)Coarse Aggregate. Cubic Yard
(c)Removal Sediment and Rock Barrier. Each
Includes removal of accumulated sediment and proper disposal of all removed materials.
Referenced in this section
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Source: Publication 408 Highway Construction Specifications, 2026 Edition. Pages 784–0 of 1,522. View official source ↗