State Route 255 over Mad River Slough
Good Condition45 years old4,300 vehicles/day
Location
| State | California |
| County | Humboldt |
| Location | 01-hum-255-r5.13 |
| Carries | State Route 255 |
| Crosses | Mad River Slough |
| Coordinates | 40.86497, -124.15050 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Prestressed Concrete Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 497.4 ft (151.6 m) |
| Max Span | 55.1 ft (16.8 m) |
| Deck Width | 43.3 ft (13.2 m) |
| Deck Area | 2001.1 sq m |
| Main Spans | 9 |
| Year Built | 1981 |
Traffic
| Avg Daily Traffic | 4,300 (2010) |
| Truck Traffic | 9% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 923 |
| Inspection Frequency | Every 48 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 04 0257 |