Route 364 Extension Phase 3 Design Build

Project Details

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 and 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. As an example, our team rephased the Bryan Road intersection 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 the proposed construction of a new flyover ramp by improving and utilizing an existing ramp. By eliminating the proposed flyover ramp, the MW Team was able to add significant scope elsewhere in the project, improving the overall project value and scope while meeting and exceeding 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.