SR D35 over Black Hawk Creek
Grundy County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR D35 over Black Hawk Creek in Grundy County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 2011, making it 14 years old at the 2025 inventory.
- It carries about 903 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 120 of the 288 inventoried bridges in Grundy County rated good (41.7%); 77 (26.7%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (good), but component ratings moved: deck 8 to 7.
- Its most recent inspection on record is dated April 2024, on a 48-month routine inspection cycle.
- 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 → (42.39167, -92.55886)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 7 | Good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 268 ft |
| Location | 088153503 |
| NBI structure number | 000000000164781 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2024 |
| Inspection interval (item 91) | 48 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Grundy County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 20 over Stream | 1999 | 14,500 | Good |
| US 20 over Stream | 1999 | 13,500 | Good |
| US 20 over Stream | 1999 | 8,800 | Good |
| US 20 WB over Grundy Rd | 2000 | 6,800 | Good |
| US 20 EB over Grundy Rd | 2000 | 6,800 | Good |
| US 20 WB over Stream | 2000 | 6,800 | Good |
All bridges nearby: Grundy County, IA bridge conditions · every bridge in Grundy County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.