Ill 26 over Brown Run
Marshall County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ill 26 over Brown Run in Marshall 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 1999, making it 26 years old at the 2025 inventory.
- It carries about 3,150 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 71 of the 155 inventoried bridges in Marshall County rated fair (45.8%); 19 (12.3%) 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 March 2021, 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 → (41.06536, -89.38097)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 131 ft |
| Location | 3.2 Mi. S. of Rt 18 |
| NBI structure number | 062007000000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 2021 |
| 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 Marshall County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-39/US 51 over Stream | 1991 | 16,500 | Fair |
| I-39/US 51(SB) over N Fk Sandy Creek | 1990 | 8,250 | Fair |
| I-39/US 51(NB) over N Fk Sandy Creek | 1990 | 8,250 | Fair |
| I-39/US 51(SB) over Sandy Creek | 1990 | 8,250 | Fair |
| I-39/US 51(NB) over Sandy Creek | 1990 | 8,250 | Fair |
| I-39/US 51(SB) over Tr 39 (frtg Rd West) | 1991 | 8,250 | Fair |
All bridges nearby: Marshall County, IL bridge conditions · every bridge in Marshall County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.