Structure 21C0034 · Napa County, CA
Carries Butts Canyon RD over Fp Creek, 3.5 Mi S Lake County Line.
A culvert 22 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 | Napa |
| Location | 3.5 Mi S Lake County Line |
| Carries | Butts Canyon RD |
| Crosses | Fp Creek |
| Coordinates | 38.66292, -122.44864 |
| Material | Steel |
| Design | Culvert |
| Total Length | 22.0 ft (6.7 m) |
| Max Span | 6.9 ft (2.1 m) |
| Deck Area | 69.7 sq m |
| Main Spans | 3 |
| Year Built | 1968 |
| Avg Daily Traffic | 240 (2012) |
| Truck Traffic | 12% |
| Lanes On Bridge | 2 |
| Last Inspection | May 2024 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 21C0034 |
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.