Tr 120 over Henderson Creek
Mercer County, Illinois · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Tr 120 over Henderson Creek in Mercer County, Illinois, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1984, making it 41 years old at the 2025 inventory.
- It carries about 25 vehicles a day (traffic count year 2024).
- Its listed owner is a town or township highway agency.
- It is one of 78 of the 163 inventoried bridges in Mercer County rated good (47.9%); 23 (14.1%) 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 December 2021, on a 48-month routine inspection cycle.
- 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 → (41.08448, -90.78468)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 81 ft |
| Location | Sw-30-t13nr3w |
| NBI structure number | 066433000000000 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | December 2021 |
| Inspection interval (item 91) | 48 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Mercer County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 67 over Donahue Creek | 1997 | 5,300 | Fair |
| US 67 over Edwards River | 1998 | 5,300 | Fair |
| Ill 94 over Edwards River | 1960 | 3,450 | Fair |
| Ill 94 over Camp Creek | 1960 | 2,900 | Fair |
| US 67 over Pope Creek | 2024 | 2,600 | Good |
| US 67 over Henderson CR | 1931 | 2,400 | Poor |
All bridges nearby: Mercer County, IL bridge conditions · every bridge in Mercer County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.