20th Avenue SE over Big Sioux River
FairCodington County, South Dakota · 1.0S & 0.5E of Watertown · Structure no. 000000015196190
- Built
- 2010
- 15 years old
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 370 ft
- 4 main spans
- Daily traffic
- 3,464
- 2022 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
20th Avenue SE over Big Sioux River is a prestressed concrete continuous stringer/multi-beam or girder carrying 20th Avenue SE over Big Sioux River in Codington County, South Dakota. It was built in 2010, so it is 15 years old, younger than the South Dakota average of 48.9 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 3,464 vehicles a day, roughly 3% of them trucks, projected to reach 5,147 by 2037. The structure is 370 ft (112.9 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 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 20th Avenue SE over Big Sioux River built?
It was built in 2010, making it 15 years old in 2025.
What condition is 20th Avenue SE over Big Sioux 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 August 2023.
How much traffic does 20th Avenue SE over Big Sioux River carry?
About 3,464 vehicles per day (2022 count), of which roughly 3% are trucks.
How long is 20th Avenue SE over Big Sioux River?
The structure is 370 ft (112.9 m) long with a longest span of 91 ft (27.7 m) and a deck 43 ft wide.
Who owns 20th Avenue SE over Big Sioux River?
It is owned by the City or Municipal Highway Agency.