Route Description
Interstate 310's mileage and exit numbers increase from north to south, the opposite of the standard Interstate numbering scheme.
Interstate 310's southern terminus is at US 90, where it travels north through flat marshlands. The southernmost mile was originally built as part of Louisiana Highway 3127, an inland bypass to Louisiana Highway 18, and is cosigned with I-310. North of I-310's first interchange, LA 3127 leaves the interstate, as I-310 heads towards the Mississippi River. After the next interchange, LA 18, Interstate 310 crosses the Mississippi River via the Luling Bridge (Hale Boggs Memorial Bridge), a cable-stayed bridge connecting the towns of Luling and Destrehan.
North of the bridge, there is an interchange with LA 48. I-310 then proceeds to the Destrehan Swamp Bridge, a five-mile (8 km) bridge over environmentally sensitive wetlands between Destrehan, Louisiana and the I-10 interchange. The northernmost two miles (3 km) of this bridge between the US 61 and I-10 interchanges was constructed using a method known as "end-on construction". This is a top-down technique in which construction platforms are mounted on concrete piles to avoid disrupting the environment below. From these platforms, the next set of piles and bridge viaducts are placed, allowing the platform to progress forward for the next set. The interstate terminates at I-10 just west of Kenner.
Read more about this topic: Interstate 310
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