Denny Road over Piscasaw Creek
Boone County, Illinois · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Denny Road over Piscasaw Creek in Boone County, Illinois, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 3 (serious condition) on the 0-9 scale.
- It was built in 1977, making it 48 years old at the 2025 inventory.
- It carries about 50 vehicles a day (traffic count year 2018).
- Its listed owner is a town or township highway agency.
- It is one of 11 of the 109 inventoried bridges in Boone County rated poor (10.1%); 11 (10.1%) are rated poor.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (42.34688, -88.7644)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 3 | Serious condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Concrete channel beam |
| Length | about 121 ft |
| Location | 2.5 SE Poplar Grove |
| NBI structure number | 004306800000000 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Boone County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 90 over Stream | 2014 | 51,100 | Fair |
| I-90 over Stream | 1958 | 28,000 | Good |
| I 90 WB over Mosquito Crk | 2013 | 28,000 | Fair |
| I 90 EB over Mosquito Ckr | 2013 | 28,000 | Good |
| I-90 over Stream | 1958 | 25,700 | Fair |
| I-90 over Stream | 1958 | 25,550 | Good |
All bridges nearby: Boone County, IL bridge conditions · every bridge in Boone County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.