Old Hwy 602 over Mill Bayou
Madison Parish, Louisiana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Old Hwy 602 over Mill Bayou in Madison Parish, Louisiana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1951, making it 74 years old at the 2025 inventory.
- It carries about 420 vehicles a day (traffic count year 2011).
- Its listed owner is the county 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.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated April 2023, on a 24-month routine inspection cycle.
- 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.
View this bridge on a map → (32.36532, -91.15485)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete tee beam |
| Length | about 98 ft |
| Location | 1.56 Mi South of I-20 |
| NBI structure number | 053301820103261 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Louisiana department of transportation.
Busiest bridges in Madison Parish
| 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 |
All bridges nearby: Madison Parish, LA bridge conditions · every bridge in Madison Parish · Louisiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.