E Big Rock Rd over Trib to Wapsipinicon Rvr
Black Hawk County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- E Big Rock Rd over Trib to Wapsipinicon Rvr in Black Hawk County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1920 and reconstructed in 1969, making it 105 years old at the 2025 inventory.
- It carries about 49 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 210 of the 489 inventoried bridges in Black Hawk County rated fair (42.9%); 25 (5.1%) are rated poor.
- Its traffic status in the 2025 inventory is open, would be posted or closed except for temporary shoring or other temporary measures (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated November 2024, 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 → (42.55531, -92.12911)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 20 ft |
| Location | 89-11-03-01-10 |
| NBI structure number | 000000000075480 |
| Condition class | Fair |
| Traffic status (item 41) | Open, would be posted or closed except for temporary shoring or other temporary measures |
| Last inspection (item 90) | November 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Black Hawk County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 218 over Quarry Lake & Wyth Rd | 1989 | 29,000 | Fair |
| US 218 over Broadway St | 1989 | 23,100 | Fair |
| US 218 over Airport Blvd | 1989 | 23,100 | Fair |
| US 218 over Cedar Rvr & Trail | 1989 | 21,500 | Fair |
| Ia 27 over Br Dry Run Creek | 1993 | 20,900 | Good |
| I 380 NB over Ianr RR Tx St Cedar Rvr | 1983 | 19,950 | Fair |
All bridges nearby: Black Hawk County, IA bridge conditions · every bridge in Black Hawk County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.