US 151 over Knapp Creek
Benton County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 151 over Knapp Creek in Benton County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 1995, making it 30 years old at the 2025 inventory.
- It carries about 7,800 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 134 of the 373 inventoried bridges in Benton County rated good (35.9%); 81 (21.7%) are rated poor.
- 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 → (41.87631, -91.84222)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 32 ft |
| Location | 1.3 mi. N of SR E66 |
| NBI structure number | 000000000014521 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Benton County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 380 over Drainage Ditch | 1982 | 21,300 | Good |
| I-380 over Prairie Creek | 1983 | 17,900 | Good |
| US 30 & 218 over Stream | 1991 | 15,400 | Fair |
| I 380 NB over Ia 150 | 1982 | 8,550 | Good |
| I 380 SB over Ia 150 | 1982 | 8,550 | Good |
| US 218 over Hinkle Creek | 1959 | 4,910 | Good |
All bridges nearby: Benton County, IA bridge conditions · every bridge in Benton County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.