Structure 210310033104005 · Cameron County, TX
Carries Pr 100 over Intracoastal Waterway, Qn Isabella Causeway.
12,510 ft end to end, longest span 310 ft: about 35 football fields, or 2.4 miles. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.
| State | Texas |
| County | Cameron |
| Location | Qn Isabella Causeway |
| Carries | Pr 100 |
| Crosses | Intracoastal Waterway |
| Coordinates | 26.08644, -97.18005 |
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 12509.8 ft (3,813 m) |
| Max Span | 310.0 ft (94.5 m) |
| Deck Width | 67.9 ft (20.7 m) |
| Deck Area | 78929.1 sq m |
| Main Spans | 3 |
| Year Built | 1974 |
| Avg Daily Traffic | 18,777 (2024) |
| Truck Traffic | 3% |
| Lanes On Bridge | 4 |
| Last Inspection | April 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Scour Critical | 6 — Scour calculated, stable |
| Structure Number | 210310033104005 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.