Structure 20C0520 · Sonoma County, CA
Carries 2nd Street over Nathanson Creek, .02 Mi So. Of E. Napa ST.
21 ft end to end. 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 or the layout of the shorter spans, so those are drawn as typical for a deck arch.
| State | California |
| County | Sonoma |
| Location | .02 Mi So. Of E. Napa ST |
| Carries | 2nd Street |
| Crosses | Nathanson Creek |
| Coordinates | 38.29122, -122.45439 |
| Material | Concrete |
| Design | Arch - Deck |
| Total Length | 21.0 ft (6.4 m) |
| Max Span | 21.0 ft (6.4 m) |
| Deck Width | 28.9 ft (8.8 m) |
| Deck Area | 56.3 sq m |
| Main Spans | 1 |
| Year Built | 1909 |
| Avg Daily Traffic | 820 (2015) |
| Truck Traffic | 1% |
| Lanes On Bridge | 2 |
| Last Inspection | June 2023 |
| Inspection Frequency | Every 24 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is on the National Register of Historic Places |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 20C0520 |
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.