Y21 Sundown RD over US 20 US 52
GoodDubuque County, Iowa · At JCT Sr- Y21 · Structure no. 000000000605745
- Built
- 1987
- 38 years old
- Condition
- Good
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 257 ft
- 4 main spans
- Daily traffic
- 6,285
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Y21 Sundown RD over US 20 US 52 is a prestressed concrete stringer/multi-beam or girder carrying Y21 Sundown RD over US 20 US 52 in Dubuque County, Iowa. It was built in 1987, so it is 38 years old, younger than the Iowa average of 45.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 6,285 vehicles a day, roughly 7% of them trucks, projected to reach 6,285 by 2042. The structure is 257 ft (78.3 m) long and 43 ft wide. If it were closed, the detour would be 9.9 mi (16 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Y21 Sundown RD over US 20 US 52 built?
It was built in 1987, making it 38 years old in 2025.
What condition is Y21 Sundown RD over US 20 US 52 in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.
How much traffic does Y21 Sundown RD over US 20 US 52 carry?
About 6,285 vehicles per day (2022 count), of which roughly 7% are trucks.
How long is Y21 Sundown RD over US 20 US 52?
The structure is 257 ft (78.3 m) long with a longest span of 82 ft (25 m) and a deck 43 ft wide.
Who owns Y21 Sundown RD over US 20 US 52?
It is owned by the State Highway Agency.