Structure 35 0122 · San Mateo County, CA
Carries Whipple Avenue over US Highway 101, 04-sm-101-6.62-rdwc.
Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.
How ratings work173 ft end to end, longest span 83 ft: about 2 semi-trucks nose to tail. Lengths and the semi-truck on the deck are drawn to the same scale. 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 multi-beam bridge.
| State | California |
| County | San Mateo |
| Location | 04-sm-101-6.62-rdwc |
| Carries | Whipple Avenue |
| Crosses | US Highway 101 |
| Coordinates | 37.49608, -122.23308 |
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 172.9 ft (52.7 m) |
| Max Span | 83.0 ft (25.3 m) |
| Deck Width | 77.4 ft (23.6 m) |
| Deck Area | 1243.7 sq m |
| Main Spans | 2 |
| Year Built | 1958 (reconstructed 1984) |
| Avg Daily Traffic | 201,000 (2000) |
| That is about 50,250 vehicles per lane per day — beyond what any U.S. road carries (the busiest freeways run about 25,000–30,000). It is almost certainly a data-entry error in the National Bridge Inventory, so we leave this bridge out of traffic rankings. | |
| Truck Traffic | 7% |
| Lanes On Bridge | 4 |
| Lanes Under 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 | Not applicable |
| Structure Number | 35 0122 |
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.