1ST St SW over Shell Rock River
Floyd County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 1ST St SW over Shell Rock River in Floyd County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2020, making it 5 years old at the 2025 inventory.
- It carries about 513 vehicles a day (traffic count year 2022).
- Its listed owner is a city or municipal highway agency.
- It is one of 108 of the 214 inventoried bridges in Floyd County rated good (50.5%); 30 (14.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated March 2023, on a 24-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 → (43.14182, -93.01004)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very 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 158 ft |
| Location | 096180707 |
| NBI structure number | 000000000008701 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 2023 |
| Inspection interval (item 91) | 24 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 Floyd County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 18 over Stewart Creek | 1998 | 11,200 | Good |
| US 18 & 218 over Stewart Creek | 1998 | 10,900 | Good |
| US 18 over Drainage Ditch | 1998 | 10,700 | Good |
| US 18 over Cedar River | 1967 | 10,500 | Fair |
| US 218 over Stream | 2001 | 10,200 | Fair |
| US 218 over Bloody Run | 1999 | 10,000 | Good |
All bridges nearby: Floyd County, IA bridge conditions · every bridge in Floyd County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.