Nd Highway 21 over Cannonball River
Good Condition43 years old350 vehicles/day
Location
| State | North Dakota |
| County | Slope |
| Location | 3 East Jct US 85 |
| Carries | Nd Highway 21 |
| Crosses | Cannonball River |
| Coordinates | 46.52612, -103.13230 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete Continuous |
| Design | Box Beam - Single/Spread |
| Total Length | 105.0 ft (32 m) |
| Max Span | 40.0 ft (12.2 m) |
| Deck Width | 38.4 ft (11.7 m) |
| Deck Area | 374.4 sq m |
| Main Spans | 3 |
| Year Built | 1983 |
Traffic
| Avg Daily Traffic | 350 (2019) |
| Truck Traffic | 38% |
| 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 | 0021003078 |