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I0310 over Mississippi River

St. Charles Parish, Louisiana · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

I0310 over Mississippi River in St. Charles Parish, Louisiana, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1983, making it 42 years old at the 2025 inventory.
It carries about 47,396 vehicles a day (traffic count year 2021).
Its listed owner is the state highway agency.
It is one of 32 of the 82 inventoried bridges in St. Charles Parish rated fair (39.0%); 1 (1.2%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Continuous steel cable-stayed girder
Length	about 2,745 ft
Location	4.4 Mi S of US 61
NBI structure number	024504503700001
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Louisiana department of transportation.

Bridge	Built	Vehicles/day	Condition
I0310 over Swamp	1992	56,783	Good
US0090 over Drain Ditch	1999	49,920	Good
US0090 over US 90 Turnarounds	2013	49,920	Good
US0090 over Davis Pond Diversion	2002	49,920	Good
US0090 over Drain Canal	1953	49,920	Fair
US0090 over Sellers Canal	1953	49,920	Fair