Grassy Road over Little Grassy Lk Spillwy
Williamson County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Grassy Road over Little Grassy Lk Spillwy in Williamson 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 1939, making it 86 years old at the 2025 inventory.
- It carries about 800 vehicles a day (traffic count year 2023).
- It is one of 60 of the 200 inventoried bridges in Williamson County rated fair (30.0%); 7 (3.5%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated June 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 → (37.647, -89.13783)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 124 ft |
| Location | 10.0 Mi SW of Hdqrtrs |
| NBI structure number | 000033610-00400 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | June 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 Williamson County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| WB Il 13 over BNSF RR | 2015 | 26,300 | Good |
| EB Il 13 over BNSF RR | 2014 | 26,300 | Fair |
| WB Il 13 over Marathon Dr | 2015 | 26,300 | Good |
| EB Il 13 over Marathon Dr | 2014 | 26,300 | Good |
| Ill 13 over Stream | 1959 | 26,300 | Good |
| Ill 13 EB over Craborchard Lake | 1964 | 25,600 | Poor |
All bridges nearby: Williamson County, IL bridge conditions · every bridge in Williamson County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.