Nd Highway 21 over Thirty Mile Creek
Fair Condition66 years old400 vehicles/day
Location
| State | North Dakota |
| County | Hettinger |
| Location | 4 East Of Burt |
| Carries | Nd Highway 21 |
| Crosses | Thirty Mile Creek |
| Coordinates | 46.37113, -102.06535 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 154.9 ft (47.2 m) |
| Max Span | 58.1 ft (17.7 m) |
| Deck Width | 34.1 ft (10.4 m) |
| Deck Area | 490.9 sq m |
| Main Spans | 3 |
| Year Built | 1960 |
Traffic
| Avg Daily Traffic | 400 (2019) |
| Truck Traffic | 13% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 623 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 0021064818 |