While the population of East Baton Rouge Parish has grown significantly in the last two decades, the I-12 Corridor has evolved substantially and become the nexus of a greater regionalism among all cities along the corridor. South Louisianans are more likely than ever to live in outlying areas of major cities and commute to work because of the accessibility the Interstate provides. It comes as no surprise that increasing the capacity on I-12 became a necessity.
The imminent need for the expansion, combined with USDOT’s focus on the “Every Day Counts” concept, brought this project to the table as a potential Design-Build candidate. This new delivery method utilized by LADOTD involves designers working with contractors and public agencies directly throughout the process, while designing and modifying the project as needed during construction. In general, the design timeline is also vastly truncated, as is the overall project delivery.
ABMB was prepared to take on this challenge. As the Lead Design firm teamed with a major contractor, ABMB put together a team with the knowledge and cohesion necessary to efficiently guide the project from conception through construction completion.
The territory included I-12 westbound from the Amite River Bridge to Juban Road, and I-12 eastbound from Pete's Highway to Juban Road – a total length of about 6 miles. To achieve the widening, the ABMB team designed a comprehensive plan including removal and replacement of some sections of pavement, mill and overlay of others, the widening and rehabilitation of three bridges, and the extension of ramp deceleration lanes.
All three bridges were widened to the inside and were redesigned to meet AASHTO LRFD specifications. ABMB also developed erosion control plans to address storm water runoff during construction, and complex maintenance of traffic and traffic control plans to maintain vehicular flow on this heavily traveled stretch of interstate during the construction. The design team continues to be actively involved in assisting the contractor in developing cost-effective solutions that meet or exceed contract scope requirements. The project is expected to be completed by Summer 2012.