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Piute Creek Bridge Riprap Replacement

San Juan County, Utah

Owner:

Bureau of Indian Affairs, Navajo Nation

Engineer:

Creamer & Noble, Inc.

Contractor:

San Juan County Utah , Dennis Lierd Construction

Installation:

May 2011

The Piute Trail system may be the largest and most diverse offroad trail system in the world. When traditional riprap installed at a bridge crossing was washed downstream, a new solution was needed. The Bureau of Indian Affairs utilized 10,000 square feet of ArmorFlex® hard armor to restore the eroded streambanks around the bridge abutments and to provide future erosion protection.

ArmorFlex Articulated Concrete Block Mats provide for a flexible matrix of concrete blocks with uniform size, shape and weight. ArmorFlex blocks are designed to have specific hydraulic capacities and are laced longitudinally with cables to ease handling and installation. The blocks come in an open-cell or closed-cell configuration, depending on the aesthetic and vegetation needs. The blocks for this project were designed to withstand the hydraulic forces that would be anticipated in the next severe storm event and consisted of a 6” closed-cell configuration.

The project was completed in approximately one month and the flexibility of the products allowed the contractor to address two issues that arose before construction. First, in order to create efficiency during installation, the mat lengths were modified. Secondly, the standard spreader bar, which is used during installation, was too large so a smaller, custom sized bar was fabricated. Once these issues were addressed, installation went smoothly.

“Contech has been extremely helpful and responsive throughout the design and construction of the Piute Creek Bridge riprap replacement project,” stated Taylor Ricks, P.E., Project Engineer with Creamer and Noble, Inc. “From providing design details, cost estimates and specs to submitting shop drawings for approval, all of the information provided led to a successful project.”

Technical Description:

  • Product: ArmorFlex® Class 55L
  • Area: 10,000 sf

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