Il 100 (NB) over Piasa Creek
Jersey County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Il 100 (NB) over Piasa Creek in Jersey 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 1997, making it 28 years old at the 2025 inventory.
- It carries about 5,150 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 43 of the 113 inventoried bridges in Jersey County rated fair (38.1%); 6 (5.3%) 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 February 2023, on a 48-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 → (38.93902, -90.2889)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 254 ft |
| Location | .7 Mi N Clifton Terr |
| NBI structure number | 042002300000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | February 2023 |
| Inspection interval (item 91) | 48 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 Jersey County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 67 SB over Piasa Creek | 2012 | 12,100 | Good |
| US 67 NB over Piasa Creek | 2012 | 12,100 | Good |
| US 67 over De Arcy Creek | 1921 | 5,300 | Fair |
| Ill 100 (SB) over Piasa Creek | 1997 | 5,150 | Good |
| Ill 100 over Elsah Creek | 1961 | 4,150 | Poor |
| Il 109 over Trib to Otter Creek | 1999 | 3,950 | Good |
All bridges nearby: Jersey County, IL bridge conditions · every bridge in Jersey County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.