Tr 39 over Trib to Mill Creek
Alexander County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Tr 39 over Trib to Mill Creek in Alexander County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1990, making it 35 years old at the 2025 inventory.
- It carries about 10 vehicles a day (traffic count year 2022).
- Its listed owner is a town or township highway agency.
- It is one of 59 of the 93 inventoried bridges in Alexander County rated fair (63.4%); 8 (8.6%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: substructure 8 to 7.
- Its most recent inspection on record is dated May 2024, 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 → (37.28763, -89.23491)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 8 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 41 ft |
| Location | 2 Mi SE of Elco |
| NBI structure number | 002308700000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2024 |
| 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 Illinois department of transportation.
Busiest bridges in Alexander County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Fai 57 over Mississippi River | 1978 | 15,000 | Fair |
| Fap 312-il 146 over Mississippi River | 2003 | 9,350 | Fair |
| Ill 146 over Drainage Ditch | 2011 | 8,550 | Good |
| I 57 NB over ILL3/US 51-cs 6010a-cnic | 1978 | 7,500 | Fair |
| I 57 SB over ILL3/US 51-cs 6010a-cnic | 1978 | 7,500 | Fair |
| Fai-57 NB over Tr-163b | 1968 | 6,100 | Fair |
All bridges nearby: Alexander County, IL bridge conditions · every bridge in Alexander County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.