30480 391st Street over Mosquito Creek
PoorCharles Mix County, South Dakota · 7.8S & 4.0W of Wagner · Structure no. 000000012470368
- Built
- 1974
- 51 years old
- Condition
- Poor
- inspected October 2023
- Type
- Channel Beam
- Concrete
- Length
- 36 ft
- 1 main span
- Daily traffic
- 48
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
30480 391st Street over Mosquito Creek is a concrete channel beam carrying 30480 391st Street over Mosquito Creek in Charles Mix County, South Dakota. It was built in 1974, so it is 51 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 48 vehicles a day, roughly 2% of them trucks, projected to reach 48 by 2032. The structure is 36 ft (11 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 30480 391st Street over Mosquito Creek built?
It was built in 1974, making it 51 years old in 2025.
What condition is 30480 391st Street over Mosquito Creek in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2023.
How much traffic does 30480 391st Street over Mosquito Creek carry?
About 48 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 30480 391st Street over Mosquito Creek?
The structure is 36 ft (11 m) long with a longest span of 35 ft (10.7 m) and a deck 29 ft wide.
Who owns 30480 391st Street over Mosquito Creek?
It is owned by the County Highway Agency.