FM over Drainage Ditch No 4
Webster County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- FM over Drainage Ditch No 4 in Webster County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1975, making it 50 years old at the 2025 inventory.
- It carries about 878 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 55 of the 190 inventoried bridges in Webster County rated fair (28.9%); 48 (25.3%) 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 → (42.51553, -94.00319)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 5 | Fair condition |
| Superstructure | 5 | Fair condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 78 ft |
| Location | 089272301 |
| NBI structure number | 000000000343091 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Webster County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| 1ST Ave S over 21ST St & RR | 1968 | 9,860 | Fair |
| US 20 over Holliday Creek | 1986 | 9,800 | Good |
| US 20 over Drainage Ditch #4 | 1986 | 9,500 | Good |
| 5TH Ave over Drainage Ditch | 1955 | 8,894 | Poor |
| N 15TH St over Soldier Creek | 1974 | 8,798 | Poor |
| US 20 over Drainage Ditch 69 | 2011 | 7,900 | Good |
All bridges nearby: Webster County, IA bridge conditions · every bridge in Webster County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.