Trinity County HBP Bridges Design-Build

Trinity County HBP Bridges Design-Build

2018 | National Award — Merit | Transportation

Trinity County HBP Bridges Design-Build

Challenge Design-Build Project Delivery Addressed

The design-build team, facing the challenge of replacing five bridges, many in remote mountainous areas, used their knowledge and experience to innovate and complete the project efficiently and cost effectively. For the four most remote structures, they used a composite precast/prefabricated design reducing the need to bring raw materials on-site, over narrow rural roads and possibly damage the environment.


The RNR Construction and Dokken Engineering team faced a daunting challenge: replace five County-owned bridges, identified as structurally deficient or functionally obsolete, in some of the most remote parts of the state as a pilot project for California. In order to get this done, the experienced design-build team selected a composite precast/prefabricated design for four of the most remote structures which reduced the need to bring raw materials on-site. The replacement bridges were designed to current seismic and structural design standards, an idyllic upgrade that turned these wooden bridges into concrete perfection. Minor approach work also enhanced the curvature of the bridges as well as sight distance lines on a project that was completed on time and under budget.

Design-Build Team

Client/Owner: Trinity County DOT
Design-Builder, Project Manager, General Contractor: R N R Construction, Inc.
Engineer: Dokken Engineering
Specialty Contractor: Verux
Specialty Consultant: Geocon Consultants, Inc.
Duration of Construction: 4 months
Project Cost: $ 6,667,500