320th Street over Medicine Creek
GoodLyman County, South Dakota · 7.8N & 5.9E of Kennebec · Structure no. 000000043309122
- Built
- 2017
- 8 years old
- Condition
- Good
- inspected July 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 65 ft
- 1 main span
- Daily traffic
- 10
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
320th Street over Medicine Creek is a prestressed concrete tee beam carrying 320th Street over Medicine Creek in Lyman County, South Dakota. It was built in 2017, so it is 8 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 10 vehicles a day, roughly 2% of them trucks, projected to reach 10 by 2032. The structure is 65 ft (19.8 m) long and 23 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| 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 320th Street over Medicine Creek built?
It was built in 2017, making it 8 years old in 2025.
What condition is 320th Street over Medicine 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 July 2024.
How much traffic does 320th Street over Medicine Creek carry?
About 10 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 320th Street over Medicine Creek?
The structure is 65 ft (19.8 m) long with a longest span of 63 ft (19.3 m) and a deck 23 ft wide.
Who owns 320th Street over Medicine Creek?
It is owned by the County Highway Agency.