NB Ia 14 over Iowa River
Marshall County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- NB Ia 14 over Iowa River in Marshall County, Iowa, 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 1968, making it 57 years old at the 2025 inventory.
- It carries about 2,950 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 73 of the 303 inventoried bridges in Marshall County rated fair (24.1%); 130 (42.9%) 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 February 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 → (42.06559, -92.90807)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 480 ft |
| Location | 0.8 Mile S of Jct SR E27 |
| NBI structure number | 000000000035420 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | February 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 Iowa department of transportation.
Busiest bridges in Marshall County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 30 over Davisons Creek | 1954 | 14,700 | Fair |
| Ia 14 over Linn Creek | 1985 | 13,300 | Good |
| Ia 14 over UP RR Madison&market St | 1985 | 13,300 | Fair |
| So. 6TH St. over Linn Creek | 1984 | 11,300 | Fair |
| So Center St over Linn Creek | 1951 | 10,448 | Poor |
| So Center St over RR and Madison St | 1951 | 9,491 | Poor |
All bridges nearby: Marshall County, IA bridge conditions · every bridge in Marshall County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.