Lanphere Road over Mad River Slough
Good Condition38 years old45 vehicles/day
Location
| State | California |
| County | Humboldt |
| Location | 2.5 Mi West Of SR 101 |
| Carries | Lanphere Road |
| Crosses | Mad River Slough |
| Coordinates | 40.89803, -124.13637 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Prestressed Concrete Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 232.0 ft (70.7 m) |
| Max Span | 76.8 ft (23.4 m) |
| Deck Width | 14.8 ft (4.5 m) |
| Deck Area | 318.1 sq m |
| Main Spans | 3 |
| Year Built | 1988 |
Traffic
| Avg Daily Traffic | 45 (2011) |
| Truck Traffic | 2% |
| Lanes On Bridge | 1 |
Inspection & Ownership
| Last Inspection | 623 |
| Inspection Frequency | Every 48 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 04C0023 |