Route 364 Extension Phase 3 Design Build

St. Charles, MO

Services Performed

Earthwork, Drainage, Box Culverts, Bridge Construction, Concrete Paving, Portable Concrete Batch Plant

Project Owner

Missouri Department of Transportation

Awards

2014 MO/KS American Concrete Pavement Association – Excellence in Paving – Urban Divided Highway Project

Project Overview

In early 2013, a joint venture including Millstone Weber (MW) was awarded a $71.8M design-build contract to construct the Rte. 364 Phase III Extension in St. Charles County, MO. Construction began in March 2013 on the project, which included seventeen (17) new bridges, fifteen (15) new Mechanically Stabilized Earth (MSE) retaining walls, and over nine (9) miles of grading and new concrete pavement. Four (4) major intersections were reconstructed as part of this project. The MW Team was selected as part of a competitive best-value process administered by the Missouri Department of Transportation (MoDOT). Through the pursuit, MW and its’ design partner were able to modify MoDOT’s conceptual design for the project in several ways to provide additional value. Examples include rephasing the project at one intersection, Bryan Road, to allow for the construction of a new overpass while maintaining traffic on an existing overpass, minimizing the impact to the traveling public. At another intersection, the MW Team was able to eliminate proposed construction of a new flyover ramp by improving and utilizing an existing ramp. In eliminating the proposed flyover ramp, the MW Team was able to add significant scope to the project elsewhere, improving the overall project value while still meeting the owners’ needs. Throughout the life of the project, MW partnered with MoDOT’s Project Team to improve project safety and minimize schedule and cost impacts by implementing new or innovative traffic control techniques, rephasing construction at various locations, and developing and executing value engineering proposals.