Johnston Road over Tassajara Creek
Fair Condition28 years old644 vehicles/day
Location
| State | California |
| County | Contra Costa |
| Location | 0.4 Mi E Camino Tassajara |
| Carries | Johnston Road |
| Crosses | Tassajara Creek |
| Coordinates | 37.78681, -121.85942 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete |
| Design | Box Beam - Multiple |
| Total Length | 70.5 ft (21.5 m) |
| Max Span | 67.9 ft (20.7 m) |
| Deck Width | 34.1 ft (10.4 m) |
| Deck Area | 223.6 sq m |
| Main Spans | 1 |
| Year Built | 1998 |
Traffic
| Avg Daily Traffic | 644 (2013) |
| Truck Traffic | 2% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | November 2024 |
| Inspection Frequency | Every 48 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 28C0202 |