State Route 4 over Middle River
Fair Condition111 years old7,200 vehicles/day
Location
| State | California |
| County | San Joaquin |
| Location | 10-sj-004-4.42 |
| Carries | State Route 4 |
| Crosses | Middle River |
| Coordinates | 37.89119, -121.49004 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 5 (Fair) |
| Superstructure | 7 (Good) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel |
| Design | Truss - Thru |
| Total Length | 544.9 ft (166.1 m) |
| Max Span | 128.6 ft (39.2 m) |
| Deck Width | 21.7 ft (6.6 m) |
| Deck Area | 1096.3 sq m |
| Main Spans | 2 |
| Year Built | 1915 |
Traffic
| Avg Daily Traffic | 7,200 (2009) |
| Truck Traffic | 11% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 423 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is eligible for the National Register |
| Structure Number | 29 0049 |