Mapes Lane RD 305 over Susan River Overflow #4
Fair Condition26 years old100 vehicles/day
Location
| State | California |
| County | Lassen |
| Location | 1.3 Mi E Of RD 304 |
| Carries | Mapes Lane RD 305 |
| Crosses | Susan River Overflow #4 |
| Coordinates | 40.33749, -120.33952 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Slab |
| Total Length | 60.0 ft (18.3 m) |
| Max Span | 20.0 ft (6.1 m) |
| Deck Width | 26.6 ft (8.1 m) |
| Deck Area | 148.2 sq m |
| Main Spans | 3 |
| Year Built | 2000 |
Traffic
| Avg Daily Traffic | 100 (1979) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 824 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 07C0042 |