W Marion St over Maquoketa River
Delaware County, Iowa · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- W Marion St over Maquoketa River in Delaware County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1980, making it 45 years old at the 2025 inventory.
- It carries about 6,294 vehicles a day (traffic count year 2022).
- Its listed owner is a city or municipal highway agency.
- It is one of 20 of the 294 inventoried bridges in Delaware County rated poor (6.8%); 20 (6.8%) are rated poor.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (42.48229, -91.45893)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 4 | Poor condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 211 ft |
| Location | 089052905 |
| NBI structure number | 000000000007546 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Delaware County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 20 over Stream | 1963 | 9,700 | Fair |
| US 20 over Stream | 1963 | 9,000 | Good |
| US 20 over Drainage Ditch | 1963 | 9,000 | Fair |
| Ia 13 over Maquoketa River | 1991 | 7,900 | Good |
| Ia 13 over US 20 | 1970 | 6,400 | Fair |
| Ia 13 over over Cc RR | 1969 | 5,900 | Fair |
All bridges nearby: Delaware County, IA bridge conditions · every bridge in Delaware County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.