Old US 51(UNMARKED over Cache River
Pulaski County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Old US 51(UNMARKED over Cache River in Pulaski 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 1920 and reconstructed in 2011, making it 105 years old at the 2025 inventory.
- It carries about 1,900 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 59 of the 108 inventoried bridges in Pulaski County rated fair (54.6%); 10 (9.3%) 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 September 2023, on a 24-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 → (37.27352, -89.18381)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 123 ft |
| Location | Ullin |
| NBI structure number | 077001600000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2023 |
| Inspection interval (item 91) | 24 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 Pulaski County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 57 & US 51 over Tr 7 Butter Ridge Rd | 1995 | 12,600 | Fair |
| I 57 over Stream | 1967 | 11,900 | Fair |
| I 57 SB & US 51 SB over Cache River | 1964 | 6,300 | Fair |
| I 57 NB & US 51 NB over Cache River | 1964 | 6,300 | Fair |
| I 57 NB & US 51 NB over Cache River Overflow | 1964 | 6,300 | Fair |
| I 57 SB & US 51 SB over Cache River Overflow | 1964 | 6,300 | Fair |
All bridges nearby: Pulaski County, IL bridge conditions · every bridge in Pulaski County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.