WB US 20 over Maquoketa River
FairDelaware County, Iowa · 1.7 Mi. E of Jct. Ia 13 · Structure no. 000000000602020
- Built
- 1973
- 52 years old
- Condition
- Fair
- inspected July 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 355 ft
- 3 main spans
- Daily traffic
- 3,850
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
WB US 20 over Maquoketa River is a steel continuous stringer/multi-beam or girder carrying WB US 20 over Maquoketa River in Delaware County, Iowa. It was built in 1973, so it is 52 years old, older than the Iowa average of 45.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 3,850 vehicles a day, roughly 31% of them trucks, projected to reach 3,850 by 2043. The structure is 355 ft (108.2 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was WB US 20 over Maquoketa River built?
It was built in 1973, making it 52 years old in 2025.
What condition is WB US 20 over Maquoketa River in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2023.
How much traffic does WB US 20 over Maquoketa River carry?
About 3,850 vehicles per day (2022 count), of which roughly 31% are trucks.
How long is WB US 20 over Maquoketa River?
The structure is 355 ft (108.2 m) long with a longest span of 137 ft (41.8 m) and a deck 44 ft wide.
Who owns WB US 20 over Maquoketa River?
It is owned by the State Highway Agency.