US 30 over Boyer River
Crawford County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 30 over Boyer River in Crawford County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1959, making it 66 years old at the 2025 inventory.
- It carries about 3,020 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 143 of the 301 inventoried bridges in Crawford County rated fair (47.5%); 23 (7.6%) 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 May 2023, 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 → (41.93662, -95.48047)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 325 ft |
| Location | 0.8 mi. E of SR M14 |
| NBI structure number | 000000000021260 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 7: scour countermeasures installed |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Crawford County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ave C over West Boyer River | 1985 | 7,347 | Fair |
| Ave C over Cc RR | 1999 | 7,158 | Fair |
| US 30 over Drainage Ditch | 1958 | 4,670 | Fair |
| US 30 & 59 over over UP RR | 1962 | 4,500 | Fair |
| US 30 & 59 over East Boyer River | 1962 | 4,500 | Fair |
| US 30 & 59 over over UP RR | 1962 | 4,400 | Fair |
All bridges nearby: Crawford County, IA bridge conditions · every bridge in Crawford County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.