Il 84 over Drainage Ditch
Rock Island County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Il 84 over Drainage Ditch in Rock Island 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 1931, making it 94 years old at the 2025 inventory.
- It carries about 4,550 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 134 of the 272 inventoried bridges in Rock Island County rated fair (49.3%); 13 (4.8%) 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 April 2024, 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 → (41.62898, -90.33604)
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 | Concrete slab |
| Length | about 23 ft |
| Location | N Edge Port Byron |
| NBI structure number | 081004500000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2024 |
| 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 Rock Island County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 74 EB over Mississippi River | 2021 | 39,050 | Good |
| I 74 WB over Mississippi River | 2020 | 39,050 | Good |
| Il 5 WB (j Deere R over Fai 74 | 1970 | 38,900 | Poor |
| Il 5 EB (j Deere R over Fai 74 | 1970 | 38,900 | Fair |
| Fai 80 over Miss R Ill 84 & RR | 1967 | 32,200 | Fair |
| IL5 over Creek | 2012 | 32,100 | Good |
All bridges nearby: Rock Island County, IL bridge conditions · every bridge in Rock Island County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.