Structure 27 0052 · Marin County, CA
Carries U.s. Highway 101 over Golden Gate-san Fran Bay, 04-mrn-101-0.01.
Set by its lowest-rated component: Deck and Superstructure at 5 of 9.
How ratings work8,997 ft end to end, longest span 4,200 ft: about 25 football fields, or 1.7 miles. 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 suspension bridge.
| State | California |
| County | Marin |
| Location | 04-mrn-101-0.01 |
| Carries | U.s. Highway 101 |
| Crosses | Golden Gate-san Fran Bay |
| Coordinates | 37.82000, -122.47667 |
| Material | Steel |
| Design | Suspension |
| Total Length | 8997.0 ft (2742.3 m) |
| Max Span | 4200.1 ft (1280.2 m) |
| Deck Width | 62.0 ft (18.9 m) |
| Deck Area | 51829.5 sq m |
| Main Spans | 3 |
| Year Built | 1937 |
| Avg Daily Traffic | 90,932 (2023) |
| Truck Traffic | 1% |
| Lanes On Bridge | 6 |
| Last Inspection | December 2024 |
| Inspection Frequency | Every 24 months |
| Owner | Local Toll Authority |
| Historical Significance | Bridge is eligible for the National Register |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 27 0052 |
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.