30th ST SW over Branch Knife River
FairStark County, North Dakota · 6 North 8 East Richardton · Structure no. 000000045152020
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected August 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 40 ft
- 1 main span
- Daily traffic
- 80
- 2018 count
- Owner
- County
- County Highway Agency
About this bridge
30th ST SW over Branch Knife River is a prestressed concrete box beam or girders - multiple carrying 30th ST SW over Branch Knife River in Stark County, North Dakota. It was built in 1971, so it is 54 years old, older than the North Dakota average of 48.2 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 80 vehicles a day, projected to reach 60 by 2038. The structure is 40 ft (12.2 m) long and 31 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 30th ST SW over Branch Knife River built?
It was built in 1971, making it 54 years old in 2025.
What condition is 30th ST SW over Branch Knife River 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 August 2024.
How much traffic does 30th ST SW over Branch Knife River carry?
About 80 vehicles per day (2018 count).
How long is 30th ST SW over Branch Knife River?
The structure is 40 ft (12.2 m) long with a longest span of 38 ft (11.6 m) and a deck 31 ft wide.
Who owns 30th ST SW over Branch Knife River?
It is owned by the County Highway Agency.