Il 99 over Missouri Creek
Brown County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Il 99 over Missouri Creek in Brown County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1931 and reconstructed in 1987, making it 94 years old at the 2025 inventory.
- It carries about 500 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 27 of the 71 inventoried bridges in Brown County rated fair (38.0%); 10 (14.1%) are rated poor.
- 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 → (40.10159, -90.76831)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 27 ft |
| Location | .25 S Schuyler Line |
| NBI structure number | 005200000000000 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Brown County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 24 over Lamoine River | 2011 | 3,050 | Fair |
| Il 107 over Mckee Creek | 1950 | 1,400 | Good |
| Il 99 over N Fork Shelby Creek | 1931 | 750 | Fair |
| Ch 6 over Purpus Creek | 1905 | 475 | Fair |
| Ch 6 over Wells Fork | 1949 | 450 | Fair |
| Ch 6 over Cronin Hollow | 1999 | 400 | Good |
All bridges nearby: Brown County, IL bridge conditions · every bridge in Brown County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.