Structure 20C0597 · Sonoma County, CA
Carries Fort Ross Road over Turner Canyon Creek, Fort Ross Road Pm 15.73.
Set by its lowest-rated component: Deck and Superstructure at 7 of 9.
How ratings work25 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 slab bridge.
| State | California |
| County | Sonoma |
| Location | Fort Ross Road Pm 15.73 |
| Carries | Fort Ross Road |
| Crosses | Turner Canyon Creek |
| Coordinates | 38.52751, -123.17888 |
| Material | Prestressed Concrete |
| Design | Slab |
| Total Length | 24.9 ft (7.6 m) |
| Max Span | 20.0 ft (6.1 m) |
| Deck Width | 20.0 ft (6.1 m) |
| Deck Area | 46.4 sq m |
| Main Spans | 1 |
| Year Built | 2024 |
| Avg Daily Traffic | 150 (2024) |
| Truck Traffic | 1% |
| Lanes On Bridge | 1 |
| Last Inspection | December 2024 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 6 — Scour calculated, stable |
| Structure Number | 20C0597 |
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.