Ch 17 over I-55
Montgomery County, Illinois · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ch 17 over I-55 in Montgomery County, Illinois, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 7 (good condition) on the 0-9 scale.
- It was built in 1973 and reconstructed in 2023, making it 52 years old at the 2025 inventory.
- It carries about 2,250 vehicles a day (traffic count year 2020).
- Its listed owner is the state highway agency.
- It is one of 135 of the 261 inventoried bridges in Montgomery County rated good (51.7%); 10 (3.8%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated poor in the 2024 inventory and is now good (deck 5 to 8, superstructure 4 to 7, substructure 6 to 7).
- Its most recent inspection on record is dated October 2024, on a 24-month routine inspection cycle.
- 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 → (39.44459, -89.64471)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 8 | Very good condition |
| Superstructure | 4 | 7 | Good condition |
| Substructure | 6 | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 299 ft |
| Location | Farmersville Interch |
| NBI structure number | 068003700000000 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Montgomery County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-55 over Horse Creek | 1972 | 31,350 | Fair |
| I-55 and FRs over Horse Creek | 1950 | 29,350 | Fair |
| FAI 55 and FRs over Shop Creek Trib | 1942 | 26,800 | Fair |
| I-55 and FRs over Shop Creek | 1943 | 26,800 | Fair |
| I-55 over Three Mile Branch | 1973 | 26,500 | Fair |
| I-55 (NB) over Macoupin Creek | 1972 | 14,400 | Fair |
All bridges nearby: Montgomery County, IL bridge conditions · every bridge in Montgomery County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.