US 101 over Hamma Hamma River
Good Condition102 years old2,911 vehicles/day
Location
| State | Washington |
| County | Mason |
| Location | 5.3 S Jefferson Co |
| Carries | US 101 |
| Crosses | Hamma Hamma River |
| Coordinates | 47.54578, -123.04261 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete |
| Design | Arch - Thru |
| Total Length | 153.9 ft (46.9 m) |
| Max Span | 149.9 ft (45.7 m) |
| Deck Width | 25.9 ft (7.9 m) |
| Deck Area | 370.5 sq m |
| Main Spans | 1 |
| Year Built | 1924 |
Traffic
| Avg Daily Traffic | 2,911 (2023) |
| Truck Traffic | 20% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 624 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is on the National Register of Historic Places |
| Structure Number | 0000734B0000000 |