Ill 136 over Mississippi Rv & RR
Whiteside County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ill 136 over Mississippi Rv & RR in Whiteside County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1974, making it 51 years old at the 2025 inventory.
- It carries about 10,500 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 201 of the 278 inventoried bridges in Whiteside County rated fair (72.3%); 23 (8.3%) 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 September 2023, 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 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 → (41.86472, -90.17299)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Steel through truss |
| Length | about 3,012 ft |
| Location | In North Clinton |
| NBI structure number | 098990800000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Whiteside County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Il 40 over Rock River | 2012 | 19,800 | Good |
| I-88 over Ditch | 1975 | 13,100 | Good |
| Fai 88 over Stream | 1975 | 12,600 | Fair |
| I-88 over Ditch | 1975 | 12,500 | Good |
| I-88 over Ditch | 1975 | 12,500 | Good |
| Il 40 Locust St over Stream | 1987 | 11,100 | Good |
All bridges nearby: Whiteside County, IL bridge conditions · every bridge in Whiteside County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.