Causeway SB over Lake Pontchartrain
Fair Condition70 years old18,830 vehicles/day
Location
| State | Louisiana |
| County | St. Tammany |
| Location | Causeway Southbound |
| Carries | Causeway SB |
| Crosses | Lake Pontchartrain |
| Coordinates | 30.36399, -90.09405 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | Unknown |
Physical Characteristics
| Material | Steel |
| Design | Movable - Bascule |
| Total Length | 127200.1 ft (38770.6 m) |
| Max Span | 180.1 ft (54.9 m) |
| Deck Width | 31.5 ft (9.6 m) |
| Deck Area | 372197.8 sq m |
| Main Spans | 1 |
| Year Built | 1956 |
Traffic
| Avg Daily Traffic | 18,830 (1987) |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | Local Toll Authority |
| Historical Significance | Bridge is eligible for the National Register |
| Structure Number | 625230123900731 |