US 6 over Spring Creek
Cass County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 6 over Spring Creek in Cass County, Iowa, 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 1960, making it 65 years old at the 2025 inventory.
- It carries about 1,760 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 112 of the 296 inventoried bridges in Cass County rated fair (37.8%); 104 (35.1%) 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 2023, 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 → (41.31747, -95.11007)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 184 ft |
| Location | 1.4 Mi. E of Jct. Ia 48 |
| NBI structure number | 000000000017390 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2023 |
| 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 Iowa department of transportation.
Busiest bridges in Cass County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-80 over Camp Creek | 1965 | 23,500 | Fair |
| I-80 over Drainage Ditch | 1959 | 23,000 | Fair |
| I-80 over Stream | 1965 | 22,400 | Fair |
| I 80 EB over Indian Creek | 2013 | 11,800 | Good |
| I 80 WB over Indian Creek | 2014 | 11,800 | Good |
| EB I-80 over 570TH St | 1966 | 11,750 | Fair |
All bridges nearby: Cass County, IA bridge conditions · every bridge in Cass County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.