Ia 12 over BNSF Rvr Sts & Ia 376
Woodbury County, Iowa · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ia 12 over BNSF Rvr Sts & Ia 376 in Woodbury County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1936 and reconstructed in 1967, making it 89 years old at the 2025 inventory.
- It carries about 20,600 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 95 of the 455 inventoried bridges in Woodbury County rated poor (20.9%); 95 (20.9%) are rated poor.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (42.48994, -96.37975)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 5 | Fair condition |
| Superstructure | 5 | Fair condition |
| Substructure | 4 | Poor condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 3,970 ft |
| Location | 0.1 mi W of Jct. IA 376 |
| NBI structure number | 000000000052830 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Woodbury County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I29 NB Off Ramp over Perry Creek Conduit | 2017 | 91,000 | Good |
| US 77 over Missouri River & Rd | 1981 | 34,600 | Fair |
| I 29 Ia 12 over Drainage-all of Roadway | 1957 | 32,900 | Fair |
| US 77 over I 29 & Ia 12 NB | 2012 | 26,900 | Good |
| I 29 SB over Pierce St Frontage Rd | 2018 | 21,100 | Fair |
| I 29 SB over Bacon Creek | 2014 | 18,900 | Fair |
All bridges nearby: Woodbury County, IA bridge conditions · every bridge in Woodbury County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.