US 30 over Ditch #77
Carroll County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 30 over Ditch #77 in Carroll County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1919 and reconstructed in 1974, making it 106 years old at the 2025 inventory.
- It carries about 13,000 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 112 of the 249 inventoried bridges in Carroll County rated fair (45.0%); 17 (6.8%) are rated poor.
- 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 → (42.06401, -94.85939)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Concrete slab |
| Length | about 24 ft |
| Location | 1.1 Mi. E. of Jct. US 71 |
| NBI structure number | 000000000017090 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Carroll County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 30 over Storm Creek | 1955 | 7,300 | Fair |
| US 30 over over UP RR | 1982 | 6,800 | Fair |
| US 30 over Middle Raccoon River | 1982 | 6,000 | Fair |
| US 71 over UP RR & Rd | 1988 | 5,600 | Fair |
| US 71 over Stream | 2000 | 5,600 | Good |
| US 71 over Middle Raccoon River | 1985 | 5,100 | Good |
All bridges nearby: Carroll County, IA bridge conditions · every bridge in Carroll County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.