Ia 4 over Drainage Ditch
Emmet County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ia 4 over Drainage Ditch in Emmet 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 1984, making it 41 years old at the 2025 inventory.
- It carries about 2,050 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 18 of the 78 inventoried bridges in Emmet County rated good (23.1%); 15 (19.2%) 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 September 2024, 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 → (43.34235, -94.79718)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 103 ft |
| Location | 1.5 mi. N of N Jct SR A34 |
| NBI structure number | 000000000024271 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2024 |
| 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 Emmet County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ia 9 over Des Moines River | 1975 | 8,200 | Fair |
| Ia 4 over West Fk Des Moines River | 1981 | 2,960 | Good |
| Ia 9 over Brown Creek | 1986 | 2,740 | Good |
| Ia 9 over E Fork Des Moines River | 1986 | 1,930 | Fair |
| Ia 4 over Drainage Ditch #2 | 2019 | 1,740 | Good |
| Ia 4 over Drainage Ditch #94 | 2019 | 1,740 | Good |
All bridges nearby: Emmet County, IA bridge conditions · every bridge in Emmet County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.