310TH St over Stream
Mills County, Iowa · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 310TH St over Stream in Mills County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1960, making it 65 years old at the 2025 inventory.
- It carries about 325 vehicles a day (traffic count year 2021).
- Its listed owner is the county highway agency.
- It is one of 35 of the 184 inventoried bridges in Mills County rated poor (19.0%); 35 (19.0%) are rated poor.
- 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 → (40.91202, -95.59449)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 4 | Poor condition |
| Superstructure | 4 | Poor condition |
| Substructure | 4 | Poor condition |
Bridge details
| Structure | Concrete slab |
| Length | about 25 ft |
| Location | 071413202 |
| NBI structure number | 000000000245180 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Mills County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-29 over Fulsom Lake Outlet | 2010 | 19,700 | Good |
| NB I-29 over St Marys Creek | 2009 | 9,850 | Good |
| SB I-29 over St Marys Creek | 2009 | 9,850 | Good |
| Locust Street over Tinkle Branch | 1976 | 8,957 | Fair |
| US 34 over Missouri River | 2014 | 7,100 | Good |
| NB I-29 over Drainage Ditch | 2009 | 6,850 | Good |
All bridges nearby: Mills County, IA bridge conditions · every bridge in Mills County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.