Risdon Road over Sdm Channel
Fair Condition56 years old450 vehicles/day
Location
| State | California |
| County | Contra Costa |
| Location | 0.25 Mi SW Oak Grove |
| Carries | Risdon Road |
| Crosses | Sdm Channel |
| Coordinates | 37.94311, -122.03349 |
Condition Ratings
| Overall Condition | Fair |
| Channel/Waterway | 9 (Excellent) |
| Culvert | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 30.8 ft (9.4 m) |
| Max Span | 14.8 ft (4.5 m) |
| Deck Width | 58.1 ft (17.7 m) |
| Deck Area | 166.4 sq m |
| Main Spans | 2 |
| Year Built | 1970 |
Traffic
| Avg Daily Traffic | 450 (2000) |
| Truck Traffic | 2% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | November 2023 |
| Inspection Frequency | Every 24 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 28C0276 |