SR 55 over Iroquois River
Newton County, Indiana · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR 55 over Iroquois River in Newton County, Indiana, 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 1961 and reconstructed in 2015, making it 64 years old at the 2025 inventory.
- It carries about 490 vehicles a day (traffic count year 2011).
- Its listed owner is the state highway agency.
- It is one of 74 of the 172 inventoried bridges in Newton County rated good (43.0%); 5 (2.9%) 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 August 2023, on a 24-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 → (40.87025, -87.3064)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 175 ft |
| Location | 00.29 N SR 16 |
| NBI structure number | 019790 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2023 |
| Inspection interval (item 91) | 24 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 Indiana department of transportation.
Busiest bridges in Newton County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-65 NB over NS RR | 1966 | 46,144 | Good |
| I-65 SB over NS RR | 1966 | 40,644 | Fair |
| I-65 NB over Kankakee River | 2018 | 24,499 | Good |
| I-65 SB over Kankakee River | 2018 | 18,482 | Good |
| I-65 NB over Dehaan Ditch | 1966 | 14,069 | Fair |
| I-65 SB over Dehaan Ditch | 1966 | 14,069 | Fair |
All bridges nearby: Newton County, IN bridge conditions · every bridge in Newton County · Indiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.