Il 251 NB over Kilbuck Creek
Winnebago County, Illinois · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Il 251 NB over Kilbuck Creek in Winnebago 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 1989, making it 36 years old at the 2025 inventory.
- It carries about 4,450 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 142 of the 465 inventoried bridges in Winnebago County rated good (30.5%); 32 (6.9%) 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 2021, on a 48-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 → (42.15997, -89.07631)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous prestressed concrete stringer or multi-beam girder |
| Length | about 222 ft |
| Location | .6 Mi N. Ogle Co.ln. |
| NBI structure number | 101015800000000 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2021 |
| Inspection interval (item 91) | 48 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Winnebago County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-39 & US 20 over Madigan Creek | 1963 | 50,900 | Fair |
| I-90 N B over US 20 Br | 2009 | 36,350 | Good |
| I-90 S B over US 20 Br | 2009 | 36,350 | Good |
| US 20 W B over Ill 251 (11TH St) | 1960 | 36,000 | Fair |
| I-90 over Stream | 1958 | 34,100 | Good |
| US 20 E B over Kishwaukee St. | 1960 | 32,000 | Fair |
All bridges nearby: Winnebago County, IL bridge conditions · every bridge in Winnebago County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.