R45 over S River
Warren County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- R45 over S River in Warren 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 2018, making it 7 years old at the 2025 inventory.
- It carries about 747 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 102 of the 238 inventoried bridges in Warren County rated good (42.9%); 48 (20.2%) 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 October 2022, 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 → (41.23021, -93.72677)
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 216 ft |
| Location | 074251004 |
| NBI structure number | 000000000333371 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2022 |
| 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 Warren County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-35 over Drainage Ditch | 1957 | 24,700 | Good |
| I 35 over Broad Horn Creek | 1957 | 21,000 | Fair |
| I-35 over Drainage Ditch | 1958 | 21,000 | Fair |
| Ia 28 over South Middle Creek | 1984 | 18,500 | Good |
| I 35 SB over North River | 2014 | 12,550 | Good |
| I 35 SB over Badger Creek | 2014 | 12,550 | Good |
All bridges nearby: Warren County, IA bridge conditions · every bridge in Warren County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.