Ia 21 over Wolf Creek
Tama County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ia 21 over Wolf Creek in Tama County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1960, making it 65 years old at the 2025 inventory.
- It carries about 2,600 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 106 of the 337 inventoried bridges in Tama County rated fair (31.5%); 107 (31.8%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: deck 6 to 5, superstructure 7 to 6.
- Its most recent inspection on record is dated July 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 → (42.25247, -92.34764)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 5 | Fair condition |
| Superstructure | 7 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 287 ft |
| Location | 0.4 Miles South of D65 |
| NBI structure number | 000000000049680 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2024 |
| 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 Tama County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 30 over Stream | 1996 | 11,500 | Good |
| US 30 WB over Slip Bridge Ramp | 2010 | 7,600 | Good |
| US 30 WB over Salt Creek | 2019 | 6,600 | Good |
| US 30 over Trib to Iowa River | 2008 | 6,500 | Good |
| US 30 WB over Iowa River | 2002 | 5,950 | Good |
| US 30 WB over Iowa River East Overflow | 2021 | 5,950 | Good |
All bridges nearby: Tama County, IA bridge conditions · every bridge in Tama County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.