Structure 28 0270 · Contra Costa County, CA
Carries Interstate 680 over Green Valley Creek, 04-cc-680-r7.64.
A culvert 25 ft across. 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 | 04-cc-680-r7.64 |
| Carries | Interstate 680 |
| Crosses | Green Valley Creek |
| Coordinates | 37.82397, -121.99384 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 24.9 ft (7.6 m) |
| Max Span | 20.0 ft (6.1 m) |
| Deck Area | 263.7 sq m |
| Main Spans | 1 |
| Year Built | 1964 |
| Avg Daily Traffic | 190,100 (2020) |
| Truck Traffic | 6% |
| Lanes On Bridge | 10 |
| Last Inspection | July 2022 |
| Inspection Frequency | Every 48 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 28 0270 |
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.