US Highway 101 NB over Willow Brook
Fair Condition70 years old94,000 vehicles/day
Location
| State | California |
| County | Sonoma |
| Location | 04-son-101-8.05-pet |
| Carries | US Highway 101 NB |
| Crosses | Willow Brook |
| Coordinates | 38.27628, -122.67519 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Slab |
| Total Length | 69.9 ft (21.3 m) |
| Max Span | 26.9 ft (8.2 m) |
| Deck Width | 109.6 ft (33.4 m) |
| Deck Area | 711.4 sq m |
| Main Spans | 3 |
| Year Built | 1956 (reconstructed 2012) |
Traffic
| Avg Daily Traffic | 94,000 (2016) |
| Truck Traffic | 6% |
| Lanes On Bridge | 6 |
Inspection & Ownership
| Last Inspection | 924 |
| Inspection Frequency | Every 48 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 20 0161 |