Ill 147 over Cedar Creek
Johnson County, Illinois · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ill 147 over Cedar Creek in Johnson 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 1937 and reconstructed in 1988, making it 88 years old at the 2025 inventory.
- It carries about 550 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 65 of the 118 inventoried bridges in Johnson County rated good (55.1%); 3 (2.5%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (good), but component ratings moved: deck 8 to 7.
- Its most recent inspection on record is dated September 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 → (37.46618, -88.7528)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 124 ft |
| Location | In Simpson |
| NBI structure number | 044002500000000 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 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 Johnson County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 24 over Dry Fork Creek | 1976 | 20,700 | Fair |
| I 24 over Mccorkle Creek | 1971 | 20,500 | Good |
| I 24 EB over Tr 42 & L Saline R | 1972 | 10,350 | Fair |
| I 24 WB over Tr 42 & L Saline R | 1972 | 10,350 | Fair |
| I 24 EB over Tr 77 Bowman Bottoms | 1971 | 10,300 | Fair |
| I 24 WB over Tr 77 Bowman Bottoms | 1971 | 10,300 | Fair |
All bridges nearby: Johnson County, IL bridge conditions · every bridge in Johnson County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.