257 ST over I029
FairMinnehaha County, South Dakota · 3.3 N I 90 Interch · Structure no. 000000050177130
- Built
- 1963
- 62 years old
- Condition
- Fair
- inspected February 2025
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 256 ft
- 4 main spans
- Daily traffic
- 160
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
257 ST over I029 is a steel continuous stringer/multi-beam or girder carrying 257 ST over I029 in Minnehaha County, South Dakota. It was built in 1963, so it is 62 years old, older 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 160 vehicles a day, roughly 2% of them trucks, projected to reach 160 by 2043. The structure is 256 ft (78.1 m) long and 32 ft wide.
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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 257 ST over I029 built?
It was built in 1963, making it 62 years old in 2025.
What condition is 257 ST over I029 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 February 2025.
How much traffic does 257 ST over I029 carry?
About 160 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is 257 ST over I029?
The structure is 256 ft (78.1 m) long with a longest span of 71 ft (21.6 m) and a deck 32 ft wide.
Who owns 257 ST over I029?
It is owned by the State Highway Agency.