FM over Big Creek
Woodbury County, Iowa · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- FM over Big Creek 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 3 (serious condition) on the 0-9 scale.
- It was built in 1962, making it 63 years old at the 2025 inventory.
- It carries about 369 vehicles a day (traffic count year 2022).
- Its listed owner is the county 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.
- Its traffic status in the 2025 inventory is posted for another load-capacity restriction (speed, number of vehicles on the bridge, etc.) (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated July 2024, on a 12-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- 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 → (42.39244, -95.80922)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 4 | 4 | Poor condition |
| Superstructure | 4 | 4 | Poor condition |
| Substructure | 3 | 3 | Serious condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 127 ft |
| Location | 088433503 |
| NBI structure number | 000000000353380 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for another load-capacity restriction (speed, number of vehicles on the bridge, etc.) |
| Last inspection (item 90) | July 2024 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
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 |
| Ia 12 over BNSF Rvr Sts & Ia 376 | 1936 | 20,600 | Poor |
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.