US 218 over Trib-shell Rock River
Bremer County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 218 over Trib-shell Rock River in Bremer 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 1996, making it 29 years old at the 2025 inventory.
- It carries about 8,300 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 96 of the 267 inventoried bridges in Bremer County rated fair (36.0%); 32 (12.0%) 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 → (42.73093, -92.53343)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 27 ft |
| Location | 1.1 Mi. N of Jct. Ia 3 |
| NBI structure number | 000000000601740 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Bremer County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 218 over Drainage Ditch | 2012 | 18,700 | Good |
| Ia 116 over Dry Run Creek | 2015 | 14,800 | Good |
| US 218 over Drainage Ditch | 2001 | 10,900 | Good |
| SB US 218 over Cedar River | 1993 | 9,700 | Fair |
| US 218 over Trib to Shell Rock River | 1996 | 9,700 | Good |
| NB US 218 over Cedar River | 1993 | 9,500 | Fair |
All bridges nearby: Bremer County, IA bridge conditions · every bridge in Bremer County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.