Nd Highway 8 over Knife River
GoodDunn County, North Dakota · 13 South of Jct. Nd 200 · Structure no. 0008099579
- Built
- 1999
- 26 years old
- Condition
- Good
- inspected October 2023
- Type
- Box Beam or Girders - Single or Spread
- Prestressed Concrete Continuous
- Length
- 167 ft
- 3 main spans
- Daily traffic
- 340
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
Nd Highway 8 over Knife River is a prestressed concrete continuous box beam or girders - single or spread carrying Nd Highway 8 over Knife River in Dunn County, North Dakota. It was built in 1999, so it is 26 years old, younger than the North Dakota average of 48.2 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 340 vehicles a day, roughly 18% of them trucks, projected to reach 410 by 2039. The structure is 167 ft (50.9 m) long and 38 ft wide. If it were closed, the detour would be 42.9 mi (69 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Nd Highway 8 over Knife River built?
It was built in 1999, making it 26 years old in 2025.
What condition is Nd Highway 8 over Knife River 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 October 2023.
How much traffic does Nd Highway 8 over Knife River carry?
About 340 vehicles per day (2019 count), of which roughly 18% are trucks.
How long is Nd Highway 8 over Knife River?
The structure is 167 ft (50.9 m) long with a longest span of 53 ft (16.2 m) and a deck 38 ft wide.
Who owns Nd Highway 8 over Knife River?
It is owned by the State Highway Agency.