ArmorFlex Utilized on Trail System After Riprap Washes Downstream


Courtesy of Contech Engineered Solutions LLC

Piute Creek Bridge Riprap Replacement

San Juan County, Utah - The Piute Trail system may be the largest and most diverse off-road trail system in the world. The main Piute trail is a loop through four Utah counties with thousands of side trails and inner loops. It winds through mostly Bureau of Land Management and National Forest lands. It boasts the highest jeep trail in Utah at 11,000+ feet and winds through canyons and deserts with a wide diversity of plants and animals.

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.”

“We learned a lot on this job,” added Cody Ekker, Project Superintendent with Dennis Lierd Construction. “It was a new product for us but once we got going, it went very smoothly.”

Bureau of Indian Affairs

Navajo Nation

Creamer & Noble, Inc.

Prime Contractor
San Juan County, Utah

Dennis Lierd Construction

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