Structure 28C0475 · Contra Costa County, CA
Carries Richmond Parkway over Parkway Wetlands, 3.6 Mi SW Of I-80.
A culvert 25 ft across with 3 openings. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights, so those are drawn as typical for a culvert.
| State | California |
| County | Contra Costa |
| Location | 3.6 Mi SW Of I-80 |
| Carries | Richmond Parkway |
| Crosses | Parkway Wetlands |
| Coordinates | 37.97261, -122.36929 |
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 24.6 ft (7.5 m) |
| Max Span | 8.2 ft (2.5 m) |
| Deck Width | 123.0 ft (37.5 m) |
| Deck Area | 281.2 sq m |
| Main Spans | 3 |
| Year Built | 1995 |
| Avg Daily Traffic | 27,000 (2012) |
| Truck Traffic | 5% |
| Lanes On Bridge | 4 |
| Last Inspection | December 2024 |
| Inspection Frequency | Every 48 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 28C0475 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.