SR 55 over Main Beaver Dam Ditch
Lake County, Indiana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR 55 over Main Beaver Dam Ditch in Lake County, Indiana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1985 and reconstructed in 2015, making it 40 years old at the 2025 inventory.
- It carries about 24,373 vehicles a day (traffic count year 2004).
- Its listed owner is the state highway agency.
- It is one of 216 of the 501 inventoried bridges in Lake County rated fair (43.1%); 36 (7.2%) 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 → (41.43816, -87.36474)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 69 ft |
| Location | 01.40 N US 231 |
| NBI structure number | 019870 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Indiana department of transportation.
Busiest bridges in Lake County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-80 WB Ramp to SR over SR 912 Eb/wb Ramps | 2001 | 185,778 | Fair |
| I-80 Ebwb 2 Ramps over Erie-lackawanna Trail | 2005 | 175,670 | Fair |
| I-80 I-94 EB over US 41 N/sr 152 W Rmp 2I | 2005 | 175,670 | Fair |
| I-80i-94 EB over Northcote Ave | 2005 | 172,512 | Good |
| I-80i-94 EB over Hohman Avenue | 2007 | 150,742 | Good |
| I-80i-94 EB over Lt Calumet Riv Monon Tr | 2007 | 150,742 | Good |
All bridges nearby: Lake County, IN bridge conditions · every bridge in Lake County · Indiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.