Structure 10 0027 · Mendocino County, CA
Carries U.s. Highway 101 over Rattlesnake Creek, 01-men-101-81.43.
Set by its lowest-rated component: Superstructure and Substructure at 5 of 9.
How ratings work24 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 | Mendocino |
| Location | 01-men-101-81.43 |
| Carries | U.s. Highway 101 |
| Crosses | Rattlesnake Creek |
| Coordinates | 39.82824, -123.57698 |
| Material | Concrete |
| Design | Arch - Deck |
| Total Length | 24.0 ft (7.3 m) |
| Max Span | 21.7 ft (6.6 m) |
| Deck Area | 124.8 sq m |
| Main Spans | 1 |
| Year Built | 1931 (reconstructed 1959) |
| Avg Daily Traffic | 6,200 (2009) |
| Lanes On Bridge | 4 |
| Last Inspection | April 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 10 0027 |
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.