Quinsippi Island R over Quincy Bay
Adams County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Quinsippi Island R over Quincy Bay in Adams County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 2013, making it 12 years old at the 2025 inventory.
- It carries about 200 vehicles a day (traffic count year 2024).
- Its listed owner is a town or township highway agency.
- It is one of 169 of the 317 inventoried bridges in Adams County rated fair (53.3%); 19 (6.0%) are rated poor.
- 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 → (39.94714, -91.4181)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 5 | Fair condition |
| Superstructure | 5 | Fair condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Steel girder and floorbeam |
| Length | about 610 ft |
| Location | SE SEC34 T15 R9W |
| NBI structure number | 001601300000000 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Adams County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Fai 172 over Fall Creek | 1982 | 13,100 | Good |
| Ill 104 over Fai 172 | 1976 | 12,000 | Fair |
| Fau 7810 (il 96) over Emery Creek | 2016 | 11,300 | Good |
| Ill 96 over Curtis Creek | 2003 | 10,500 | Fair |
| Fai 172 over Austin Creek | 1982 | 9,750 | Fair |
| US 24(WB)/ Broadwa over Miss. R/streets/bnrr | 1986 | 8,600 | Fair |
All bridges nearby: Adams County, IL bridge conditions · every bridge in Adams County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.