Duncan Rd. over Br. Spoon River
Peoria County, Illinois · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Duncan Rd. over Br. Spoon River in Peoria County, Illinois, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 8 (very good condition) on the 0-9 scale.
- It was built in 1991, making it 34 years old at the 2025 inventory.
- It carries about 250 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 76 of the 351 inventoried bridges in Peoria County rated good (21.7%); 63 (17.9%) are rated poor.
- 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 → (40.96623, -89.79353)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 9 | Excellent condition |
| Superstructure | 9 | Excellent condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 95 ft |
| Location | E.ctr-3-t11nr6e |
| NBI structure number | 072312700000000 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Peoria County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| EB I-474 474 Rp 1. over Ill 8 | 1978 | 36,600 | Fair |
| EB I-74 Rp F-2 over Glen Oak Ave | 2006 | 35,800 | Fair |
| US 150 over Big Hollow Creek | 1940 | 35,400 | Fair |
| US 150 WB over Il 29 | 1995 | 30,000 | Poor |
| WB I-74 over Glen Oak Ave | 2006 | 28,900 | Fair |
| SB Ill 6 over WB I-74 | 1978 | 28,400 | Fair |
All bridges nearby: Peoria County, IL bridge conditions · every bridge in Peoria County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.