471st Street over North Deer Ck
PoorBrookings County, South Dakota · 10.4N Brookings · Structure no. 000000006170056
- Built
- 1925
- 100 years old, rebuilt 1940
- Condition
- Poor
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 74 ft
- 2 main spans
- Daily traffic
- 462
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
471st Street over North Deer Ck is a steel stringer/multi-beam or girder carrying 471st Street over North Deer Ck in Brookings County, South Dakota. It was built in 1925 and reconstructed in 1940, so it is 100 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 462 vehicles a day, roughly 3% of them trucks, projected to reach 462 by 2032. The structure is 74 ft (22.6 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 471st Street over North Deer Ck built?
It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1940.
What condition is 471st Street over North Deer Ck 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 2024.
How much traffic does 471st Street over North Deer Ck carry?
About 462 vehicles per day (2022 count), of which roughly 3% are trucks.
How long is 471st Street over North Deer Ck?
The structure is 74 ft (22.6 m) long with a longest span of 36 ft (11 m) and a deck 33 ft wide.
Who owns 471st Street over North Deer Ck?
It is owned by the County Highway Agency.