US 34 over West Nishnabotna River
Mills County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 34 over West Nishnabotna River in Mills 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 1990, making it 35 years old at the 2025 inventory.
- It carries about 4,260 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 54 of the 184 inventoried bridges in Mills County rated good (29.3%); 35 (19.0%) 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 April 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 → (41.03061, -95.51087)
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 | Prestressed concrete stringer or multi-beam girder |
| Length | about 428 ft |
| Location | 0.6 Mi. W of W Jct SR M16 |
| NBI structure number | 000000000035931 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
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.