Il 105 (eb)(fap 74 over Lake Decatur
Macon County, Illinois · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Il 105 (eb)(fap 74 over Lake Decatur in Macon County, Illinois, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 7 (good condition) on the 0-9 scale.
- It was built in 1970 and reconstructed in 2023, making it 55 years old at the 2025 inventory.
- It carries about 7,800 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 85 of the 346 inventoried bridges in Macon County rated good (24.6%); 54 (15.6%) are rated poor.
- 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 → (39.85229, -88.88334)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 9 | Excellent condition |
| Superstructure | 9 | Excellent condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 369 ft |
| Location | In Decatur |
| NBI structure number | 058004700000000 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Macon County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Fap 322(US 51) over I-72 | 2011 | 24,400 | Fair |
| US 51 NB (fap 710) over Lake Decatur | 1962 | 22,400 | Fair |
| US 51 SB (fap 710) over Lake Decatur | 1971 | 22,400 | Fair |
| US 36(FAP 320) over Lake Shore Dr(u 7390 | 1954 | 20,900 | Poor |
| US 36(FAP 320) over Lake Decatur | 1955 | 20,900 | Fair |
| Fap 320(IL 121) over NS RR | 1991 | 18,900 | Fair |
All bridges nearby: Macon County, IL bridge conditions · every bridge in Macon County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.