310TH St over Deadbrier Creek
Greene County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 310TH St over Deadbrier Creek in Greene County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1998, making it 27 years old at the 2025 inventory.
- It carries about 26 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 82 of the 168 inventoried bridges in Greene County rated fair (48.8%); 25 (14.9%) 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 July 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 → (41.90644, -94.35299)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Concrete slab |
| Length | about 33 ft |
| Location | 1.2 mi. east IA 4 |
| NBI structure number | 000000000365780 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 4: foundations stable, field review says exposed foundations need protection |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Greene County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ia 4 (N Elm St) over UP RR & Mckinley St | 2012 | 6,200 | Good |
| US 30 over UP RR & 222ND | 2017 | 4,970 | Good |
| US 30 over West Beaver Creek | 2017 | 4,970 | Good |
| US 30 over Little Beaver Creek | 2009 | 4,570 | Good |
| US 30 over Hardin Creek | 1957 | 4,230 | Fair |
| US 30 over Buttrick Creek | 1957 | 4,230 | Fair |
All bridges nearby: Greene County, IA bridge conditions · every bridge in Greene County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.