I0055 over I-55 Off Ramp @ US 51

St. John the Baptist Parish, Louisiana · rated Good in the 2025 National Bridge Inventory

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

• I0055 over I-55 Off Ramp @ US 51 in St. John the Baptist Parish, Louisiana, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
• It was built in 1975, making it 50 years old at the 2025 inventory.
• It carries about 15,642 vehicles a day (traffic count year 2021).
• Its listed owner is the state highway agency.
• It is one of 13 of the 40 inventoried bridges in St. John the Baptist Parish rated good (32.5%); 1 (2.5%) are rated poor.
• A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

View this bridge on a map → (30.09481, -90.439)

Component ratings

Bridge details

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

Busiest bridges in St. John the Baptist Parish

All bridges nearby: St. John the Baptist Parish, LA bridge conditions · every bridge in St. John the Baptist Parish · Louisiana bridges.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.