Structure 21C0127 · Napa County, CA
Carries First Street over Napa CR & River Overflow, Just East Of West Street.
344 ft end to end, longest span 115 ft: about 5 semi-trucks nose to tail. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a box-beam bridge.
| State | California |
| County | Napa |
| Location | Just East Of West Street |
| Carries | First Street |
| Crosses | Napa CR & River Overflow |
| Coordinates | 38.29945, -122.28483 |
| Material | Prestressed Concrete Continuous |
| Design | Box Beam - Multiple |
| Total Length | 344.5 ft (105 m) |
| Max Span | 114.8 ft (35 m) |
| Deck Width | 66.3 ft (20.2 m) |
| Deck Area | 2,121 sq m |
| Main Spans | 3 |
| Year Built | 2005 |
| Avg Daily Traffic | 5,235 (2011) |
| Truck Traffic | 2% |
| Lanes On Bridge | 2 |
| Last Inspection | May 2024 |
| Inspection Frequency | Every 24 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 21C0127 |
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.