US 30 over Noah Creek
Boone County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 30 over Noah Creek in Boone County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1962 and reconstructed in 1975, making it 63 years old at the 2025 inventory.
- It carries about 8,800 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 58 of the 134 inventoried bridges in Boone County rated fair (43.3%); 38 (28.4%) are rated poor.
- 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 → (42.03357, -93.95071)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 23 ft |
| Location | at Junction With SR R18 |
| NBI structure number | 000000000015190 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Boone County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 30 over Honey Creek | 1962 | 8,800 | Fair |
| US 30 & 169 over East Beaver Creek | 1962 | 5,900 | Good |
| Ia 17 over Big Creek | 1961 | 5,300 | Fair |
| Ia 17 over US 30 | 1968 | 4,960 | Fair |
| US 30 EB over Des Moines River | 1963 | 4,400 | Fair |
| US 30 WB over Des Moines River | 1963 | 4,350 | Fair |
All bridges nearby: Boone County, IA bridge conditions · every bridge in Boone County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.