“The CityArchRiver 2015 initiative is truly a project of national significance. The project to better weave the Gateway Arch and Jefferson National Expansion Memorial (JNEM) into the fabric of St. Louis is intended to serve as a model for generations to come and for other areas struggling with similar issues of making cities more livable and more welcoming to visitors.”
CBB’s experience with the CAR 2015 project began Fall, 2009 during the competition phase. Achieving the project goals of improved pedestrian and vehicular access and circulation to the JNEM ultimately required modifications to the local transportation network. Early in the project CBB identified a number of critical points of disconnect within the pedestrian and vehicular travel ways, and has endeavored to rectify as many of those situations as possible within the limits of CAR 2015. Throughout the project, CBB provided feedback to designers and stakeholders, offering suggestions and support to turn vision into reality.
On more than one occasion, CBB staff was able to turn a potential barrier to implementation of the project into a benefit for the St. Louis transportation network. For example, the removal of a segment of Memorial Drive between I-70 and the river reduced the number of access points to westbound I-70. CBB developed a concept to modify arterial connections that reestablished access and was not prohibitively costly.
In order to analyze the multiple design scenarios, CBB developed traffic volume projections for the study area, taking into account both programmed projects and proposed development. CBB additionally constructed both microsimulation (VISSIM) freeway and macrosimulation (Synchro) arterial model networks of the study area using a turnkey approach to integrate the various tools and analysis methodologies. CBB documented this analysis and related project information to support a final Access Justification Report (AJR) for the CAR 2015 project.
While completing that AJR, CBB expanded our work with the project as a partner to MoDOT and their efforts to modify their portions of the downtown St. Louis freeway network. CBB was responsible for another, related, AJR document for the modifications to the Poplar Street Bridge (PSB), an interstate river crossing adjacent to the JNEM. This project aimed to relieve safety and capacity concerns at the PSB interchange through significant geometric and access modifications: the removal of the ramp from eastbound I-70 and the downtown arterial network to the PSB, and widening the connections between the bridge and I-55 to two lanes. Although these changes were approved previously, they became rather contentious and a source of great debate during project planning. CBB supported MoDOT with additional investigation and documentation to support coordination with Illinois stakeholders throughout the planning process. In order to analyze the multiple design scenarios, CBB expanded on the traffic volume projections and the freeway (VISSIM) and arterial (Synchro) model networks of the study area created for the CAR 2015 project again using a turnkey approach to integrate the various tools and analysis methodologies. CBB’s operational models are still being utilized to support additional investigation by both MDOT and the City of St. Louis.
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12400 Olive Boulevard, Suite 430
St. Louis, MO 63141