On the Greaux is a DOTD project to widen Interstate 10 from four lanes to six lanes between Highland Road in Baton Rouge and La. 73 in Ascension Parish. This 6.5-mile segment of the interstate carries more than 95,000 vehicles a day.
Construction on the project began in February 2018 and is expected to take about two years to complete.
This east-west corridor is frequently congested during morning and afternoon commutes by people traveling between Baton Rouge and the rapidly growing suburban areas of northern Ascension Parish. This portion of I-10 also is part of the main route between Baton Rouge and New Orleans and is one of the busiest surface freight routes in Louisiana.
Three three eastbound lanes and three westbound lanes will be affected by On the Greaux. DOTD will rebuild the I-10 overpass above Highland Road, replacing the existing two bridges with one large overpass with three eastbound lanes, three westbound lanes. The bridge that carries La. 928, known locally as Bluff Road, over I-10 will be closed over the Summer of 2018 so it can be raised 9.5 inches to accommodate new interstate standards. And, the I-10 bridge over Bayou Manchac at the East Baton Rouge/Ascension parish line will be widened to accommodate six full traffic lanes.
On the Greaux is being constructed under an innovative process called design-build, which can cut the cost and construction time of large transportation projects. Under design-build, a construction contractor and engineer-designer join forces to work concurrently on design and construction plans. This is different than the traditional design-bid-build process, in which an engineering team designs the project, the owner bids out the construction work, and a contractor builds the project.