K64 over Drainage
Woodbury County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- K64 over Drainage in Woodbury County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2021, making it 4 years old at the 2025 inventory.
- It carries about 928 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 178 of the 455 inventoried bridges in Woodbury County rated good (39.1%); 95 (20.9%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (good), but component ratings moved: deck 9 to 8, superstructure 9 to 8, substructure 9 to 8.
- Its most recent inspection on record is dated July 2024, on a 48-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (42.4745, -96.07696)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 9 | 8 | Very good condition |
| Superstructure | 9 | 8 | Very good condition |
| Substructure | 9 | 8 | Very good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 70 ft |
| Location | 088450302 |
| NBI structure number | 000000000353631 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2024 |
| Inspection interval (item 91) | 48 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
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.