US Highway 101 SB over Mad River
Good Condition15 years old18,500 vehicles/day
Location
| State | California |
| County | Humboldt |
| Location | 01-hum-101-89.63 |
| Carries | US Highway 101 SB |
| Crosses | Mad River |
| Coordinates | 40.91556, -124.09262 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete Continuous |
| Design | Box Beam - Multiple |
| Total Length | 750.0 ft (228.6 m) |
| Max Span | 225.1 ft (68.6 m) |
| Deck Width | 39.0 ft (11.9 m) |
| Deck Area | 2720.3 sq m |
| Main Spans | 4 |
| Year Built | 2011 |
Traffic
| Avg Daily Traffic | 18,500 (2010) |
| Truck Traffic | 12% |
| Lanes On Bridge | 3 |
Inspection & Ownership
| Last Inspection | November 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 04 0311L |