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LA0577 over I-20

Madison Parish, Louisiana · rated Fair in the 2025 National Bridge Inventory

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

LA0577 over I-20 in Madison Parish, Louisiana, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1971, making it 54 years old at the 2025 inventory.
It carries about 184 vehicles a day (traffic count year 2021).
Its listed owner is the state highway agency.
It is one of 79 of the 104 inventoried bridges in Madison Parish rated fair (76.0%); 7 (6.7%) 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	Prestressed concrete stringer or multi-beam girder
Length	about 283 ft
Location	La 577 over I-20
NBI structure number	053301640214411
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I0020 over Mississippi River	1973	36,023	Fair
I0020 over Bayou Macon	1971	31,481	Fair
I0020 over Bayou Macon	1971	31,481	Fair
I0020 over Drainage	1971	31,481	Fair
I0020 over Drainage	1971	31,481	Fair
I0020 over Joes Bayou Lake	1971	31,481	Fair