Structure 55 0523S · Orange County, CA
Carries Ramp/connector 405 over Lane Channel, 12-ora-405-6.86-irvn.
A culvert 39 ft across with 3 openings. Lengths and the car on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights, so those are drawn as typical for a culvert.
| State | California |
| County | Orange |
| Location | 12-ora-405-6.86-irvn |
| Carries | Ramp/connector 405 |
| Crosses | Lane Channel |
| Coordinates | 33.67643, -117.84108 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 39.0 ft (11.9 m) |
| Max Span | 12.1 ft (3.7 m) |
| Deck Width | 43.3 ft (13.2 m) |
| Deck Area | 157.1 sq m |
| Main Spans | 3 |
| Year Built | 1968 |
| Avg Daily Traffic | 240,000 (2015) |
| That is about 80,000 vehicles per lane per day — beyond what any U.S. road carries (the busiest freeways run about 25,000–30,000). It is almost certainly a data-entry error in the National Bridge Inventory, so we leave this bridge out of traffic rankings. | |
| Truck Traffic | 5% |
| Lanes On Bridge | 3 |
| Last Inspection | January 2025 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 55 0523S |
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.