478th Ave HWY 121 over Slip-Up Creek
GoodMinnehaha County, South Dakota · 4E & 1.3S Baltic · Structure no. 000000050240073
- Built
- 2013
- 12 years old
- Condition
- Good
- inspected June 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 54 ft
- 4 main spans
- Daily traffic
- 1,152
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
478th Ave HWY 121 over Slip-Up Creek is a concrete continuous culvert carrying 478th Ave HWY 121 over Slip-Up Creek in Minnehaha County, South Dakota. It was built in 2013, so it is 12 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 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 1,152 vehicles a day, roughly 3% of them trucks, projected to reach 1,337 by 2038. The structure is 54 ft (16.5 m) long. If it were closed, the detour would be 6.2 mi (10 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 |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 478th Ave HWY 121 over Slip-Up Creek built?
It was built in 2013, making it 12 years old in 2025.
What condition is 478th Ave HWY 121 over Slip-Up Creek 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 June 2024.
How much traffic does 478th Ave HWY 121 over Slip-Up Creek carry?
About 1,152 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is 478th Ave HWY 121 over Slip-Up Creek?
The structure is 54 ft (16.5 m) long with a longest span of 14 ft (4.2 m).
Who owns 478th Ave HWY 121 over Slip-Up Creek?
It is owned by the County Highway Agency.