US 101 Mcdonnell over Millbrae Slough
Fair Condition79 years old226,000 vehicles/day
Location
| State | California |
| County | San Mateo |
| Location | 04-sm-101-18.09-mlbr |
| Carries | US 101 Mcdonnell |
| Crosses | Millbrae Slough |
| Coordinates | 37.60406, -122.38226 |
Condition Ratings
| Overall Condition | Fair |
| Channel/Waterway | 7 (Good) |
| Culvert | 5 (Fair) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 34.1 ft (10.4 m) |
| Max Span | 9.8 ft (3 m) |
| Deck Area | 266.2 sq m |
| Main Spans | 3 |
| Year Built | 1947 (reconstructed 1961) |
Traffic
| Avg Daily Traffic | 226,000 (2009) |
| Truck Traffic | 4% |
| Lanes On Bridge | 17 |
Inspection & Ownership
| Last Inspection | 423 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 35 0126 |