L22 over Willow Creek
Sioux County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- L22 over Willow Creek in Sioux County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1955 and reconstructed in 1975, making it 70 years old at the 2025 inventory.
- It carries about 359 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 281 of the 448 inventoried bridges in Sioux County rated good (62.7%); 14 (3.1%) 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 March 2023, on a 24-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 → (43.02245, -95.89957)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 78 ft |
| Location | 095432602 |
| NBI structure number | 000000000309840 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 2023 |
| Inspection interval (item 91) | 24 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 Sioux County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 75 over W Fork Floyd River | 1989 | 7,300 | Good |
| US 75 over Stream | 1998 | 7,300 | Good |
| US 18 over Rogg Creek | 1985 | 6,700 | Good |
| Ia 60 over Stream | 1991 | 6,500 | Good |
| Ia 10 over Floyd River | 1993 | 5,300 | Fair |
| US 18 over Drainage Ditch | 1976 | 5,200 | Fair |
All bridges nearby: Sioux County, IA bridge conditions · every bridge in Sioux County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.