485th Avenue over Trib to Four Mile Ck
FairMinnehaha County, South Dakota · 2W & 3.4S Valley Springs · Structure no. 000000050310214
- Built
- 1981
- 44 years old
- Condition
- Fair
- inspected June 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 67 ft
- 1 main span
- Daily traffic
- 29
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
485th Avenue over Trib to Four Mile Ck is a prestressed concrete tee beam carrying 485th Avenue over Trib to Four Mile Ck in Minnehaha County, South Dakota. It was built in 1981, so it is 44 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 29 vehicles a day, roughly 2% of them trucks, projected to reach 35 by 2038. The structure is 67 ft (20.4 m) long and 32 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 485th Avenue over Trib to Four Mile Ck built?
It was built in 1981, making it 44 years old in 2025.
What condition is 485th Avenue over Trib to Four Mile Ck 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 June 2024.
How much traffic does 485th Avenue over Trib to Four Mile Ck carry?
About 29 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is 485th Avenue over Trib to Four Mile Ck?
The structure is 67 ft (20.4 m) long with a longest span of 65 ft (19.8 m) and a deck 32 ft wide.
Who owns 485th Avenue over Trib to Four Mile Ck?
It is owned by the County Highway Agency.