Swtwater Spring RD over Porter Creek
Fair Condition52 years old140 vehicles/day
Location
| State | California |
| County | Sonoma |
| Location | 6.1 Mi W Armstrong RD |
| Carries | Swtwater Spring RD |
| Crosses | Porter Creek |
| Coordinates | 38.54568, -122.94134 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 5 (Fair) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | Unknown |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 40.0 ft (12.2 m) |
| Max Span | 14.4 ft (4.4 m) |
| Deck Width | 14.1 ft (4.3 m) |
| Deck Area | 52.5 sq m |
| Main Spans | 3 |
| Year Built | 1974 |
Traffic
| Avg Daily Traffic | 140 (2015) |
| Truck Traffic | 1% |
| Lanes On Bridge | 1 |
Inspection & Ownership
| Last Inspection | 723 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 20C0366 |