Dalton Highway over Mid Fork Koyukuk River 4
Fair Condition54 years old110 vehicles/day
Location
| State | Alaska |
| County | Yukon-Koyukuk |
| Location | Mile Point 204.4 |
| Carries | Dalton Highway |
| Crosses | Mid Fork Koyukuk River 4 |
| Coordinates | 67.61629, -149.79534 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 7 — Countermeasures installed |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 123.0 ft (37.5 m) |
| Max Span | 60.0 ft (18.3 m) |
| Deck Width | 27.6 ft (8.4 m) |
| Deck Area | 315 sq m |
| Main Spans | 1 |
| Year Built | 1972 (reconstructed 1992) |
Traffic
| Avg Daily Traffic | 110 (2020) |
| Truck Traffic | 62% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 724 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 1284 |