State Route 18 over Lower Bonnie Canyon
Fair Condition57 years old16,800 vehicles/day
Location
| State | California |
| County | San Bernardino |
| Location | 08-sbd-018-r14.78 |
| Carries | State Route 18 |
| Crosses | Lower Bonnie Canyon |
| Coordinates | 34.22650, -117.29719 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 5 (Fair) |
| Substructure | 7 (Good) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 9 — Foundation above flood level |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Box Beam - Multiple |
| Total Length | 161.1 ft (49.1 m) |
| Max Span | 161.1 ft (49.1 m) |
| Deck Width | 62.7 ft (19.1 m) |
| Deck Area | 937.8 sq m |
| Main Spans | 1 |
| Year Built | 1969 |
Traffic
| Avg Daily Traffic | 16,800 (2017) |
| Truck Traffic | 10% |
| Lanes On Bridge | 4 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 54 0923 |