Fai 70A over Mississippi River
St. Clair County, Illinois · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Fai 70A over Mississippi River in St. Clair County, Illinois, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 2014, making it 11 years old at the 2025 inventory.
- It carries about 33,800 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 235 of the 485 inventoried bridges in St. Clair County rated good (48.5%); 45 (9.3%) 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 May 2024, on a 24-month routine inspection cycle.
- It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
- 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 → (38.6458, -90.17847)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Continuous steel cable-stayed girder |
| Length | about 6,461 ft |
| Location | River Crossing Main |
| NBI structure number | 082034800000000 |
| Condition class | Good |
| 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 |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in St. Clair County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Psb I-55 64;US 40 over Mississippi River | 1963 | 113,200 | Fair |
| I-55/64; US 40 Psc over Trra | 1966 | 113,200 | Poor |
| I-55/64; US 40 EB over 4TH ST in E ST LOU | 1965 | 105,300 | Fair |
| EB 55/MLK Eb&wb Ap over 3RD ST EXIT to EStL | 1961 | 105,300 | Good |
| I-55/70;/64 over Csxrr Nsrr Trrarr | 1959 | 66,500 | Poor |
| I-55/64EB mainlne" over UPRR IL 3 ramp UPRR UPRR | 1995 | 56,600 | Fair |
All bridges nearby: St. Clair County, IL bridge conditions · every bridge in St. Clair County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.