446TH Ave over Stream
Jackson County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 446TH Ave over Stream in Jackson 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 2023, making it 2 years old at the 2025 inventory.
- It carries about 49 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 78 of the 252 inventoried bridges in Jackson County rated good (31.0%); 36 (14.3%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It does not appear under this structure number in the 2024 inventory (a new or renumbered structure).
- Its most recent inspection on record is dated October 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 → (42.05282, -90.37921)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 8 | Very good condition |
| Superstructure | 8 | Very good condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 40 ft |
| Location | 0.03 Mi North of IA 64 |
| NBI structure number | 000000000192771 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 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 Jackson County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 61 over Drainage Ditch | 1967 | 8,100 | Good |
| Y53 200TH Ave over Prairie Creek | 2022 | 7,205 | Good |
| US 61 NB over S Fork Maquoketa River | 1967 | 5,100 | Fair |
| US 61 SB over S Fork Maquoket River | 1998 | 5,100 | Fair |
| NB US 61 over Prairie Creek | 1967 | 4,600 | Fair |
| SB US 61 over Prairie Creek | 1996 | 4,600 | Good |
All bridges nearby: Jackson County, IA bridge conditions · every bridge in Jackson County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.