450TH over Stream
Worth County, Iowa · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 450TH over Stream in Worth 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 1962, making it 63 years old at the 2025 inventory.
- It carries about 34 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 17 of the 116 inventoried bridges in Worth County rated poor (14.7%); 17 (14.7%) 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 November 2023, on a 24-month routine inspection cycle.
- 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 → (43.41501, -93.14146)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 4 | 4 | Poor condition |
Bridge details
| Structure | Concrete slab |
| Length | about 32 ft |
| Location | 099201201 |
| NBI structure number | 000000000356070 |
| Condition class | Poor |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | November 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 Worth County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-35 over Drainage Ditch | 1972 | 20,600 | Good |
| I-35 over Goose Creek | 1972 | 20,100 | Fair |
| NB I 35 over over UP RR | 1970 | 10,700 | Fair |
| SB I 35 over over UP RR | 1970 | 10,500 | Fair |
| NB I-35 over Elk Creek | 1972 | 9,950 | Fair |
| SB I-35 over Elk Creek | 1972 | 9,750 | Fair |
All bridges nearby: Worth County, IA bridge conditions · every bridge in Worth County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.