State Route 178 over Isabella Drain
Good Condition78 years old4,200 vehicles/day
Location
| State | California |
| County | Kern |
| Location | 06-ker-178-r44.10 |
| Carries | State Route 178 |
| Crosses | Isabella Drain |
| Coordinates | 35.64025, -118.46429 |
Condition Ratings
| Overall Condition | Good |
| Channel/Waterway | 6 (Satisfactory) |
| Culvert | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 24.0 ft (7.3 m) |
| Max Span | 12.1 ft (3.7 m) |
| Deck Area | 124.8 sq m |
| Main Spans | 2 |
| Year Built | 1948 (reconstructed 1974) |
Traffic
| Avg Daily Traffic | 4,200 (2009) |
| Truck Traffic | 9% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | December 2022 |
| Inspection Frequency | Every 48 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 50 0046 |