Nd Highway 21 over Thirty Mile Creek
FairHettinger County, North Dakota · 4 East of Burt · Structure no. 0021064818
- Built
- 1960
- 65 years old
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 155 ft
- 3 main spans
- Daily traffic
- 400
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
Nd Highway 21 over Thirty Mile Creek is a steel stringer/multi-beam or girder carrying Nd Highway 21 over Thirty Mile Creek in Hettinger County, North Dakota. It was built in 1960, so it is 65 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 6 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 400 vehicles a day, roughly 13% of them trucks, projected to reach 608 by 2039. The structure is 155 ft (47.2 m) long and 34 ft wide. If it were closed, the detour would be 60.3 mi (97 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| 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 Nd Highway 21 over Thirty Mile Creek built?
It was built in 1960, making it 65 years old in 2025.
What condition is Nd Highway 21 over Thirty Mile Creek 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 June 2023.
How much traffic does Nd Highway 21 over Thirty Mile Creek carry?
About 400 vehicles per day (2019 count), of which roughly 13% are trucks.
How long is Nd Highway 21 over Thirty Mile Creek?
The structure is 155 ft (47.2 m) long with a longest span of 58 ft (17.7 m) and a deck 34 ft wide.
Who owns Nd Highway 21 over Thirty Mile Creek?
It is owned by the State Highway Agency.