Structure 35 0064 · San Mateo County, CA
Carries U.s. Highway 101 over Marsh Creek, 04-sm-101-3.70-mlp.
A culvert 21 ft across with 2 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 | San Mateo |
| Location | 04-sm-101-3.70-mlp |
| Carries | U.s. Highway 101 |
| Crosses | Marsh Creek |
| Coordinates | 37.48413, -122.18244 |
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 20.7 ft (6.3 m) |
| Max Span | 9.8 ft (3 m) |
| Deck Width | 275.6 ft (84 m) |
| Deck Area | 529.2 sq m |
| Main Spans | 2 |
| Year Built | 1930 (reconstructed 1958) |
| Avg Daily Traffic | 199,000 (2009) |
| Truck Traffic | 4% |
| Lanes On Bridge | 10 |
| Last Inspection | August 2023 |
| 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 | 35 0064 |
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.