Il 150 over Little Marys River
Randolph County, Illinois · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Il 150 over Little Marys River in Randolph 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 1999, making it 26 years old at the 2025 inventory.
- It carries about 5,450 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 87 of the 149 inventoried bridges in Randolph County rated good (58.4%); 10 (6.7%) 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 2024, 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 → (37.94899, -89.76686)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 216 ft |
| Location | 1.8MI N. of Chester |
| NBI structure number | 079004500000000 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2024 |
| Inspection interval (item 91) | 48 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Randolph County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Il 3 over Black Creek | 1995 | 8,400 | Good |
| Ill 150 over Miss Riv/fau 9416 | 1942 | 6,250 | Poor |
| Il 3 over UPRR | 1971 | 5,650 | Good |
| Il 3 over Nine Mile Creek | 2024 | 5,650 | Good |
| Ill 4-150 over Marys River | 1928 | 5,500 | Fair |
| Ill 4 & 150 over Cox Creek | 1977 | 4,900 | Fair |
All bridges nearby: Randolph County, IL bridge conditions · every bridge in Randolph County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.