Structure 55C0600 · Orange County, CA
Carries Portola Parkway over Borrego Canyon Wash, 0.11 Mi. E/o Alton Pkwy..
A culvert 24 ft across. 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, so those are drawn as typical for a culvert.
| State | California |
| County | Orange |
| Location | 0.11 Mi. E/o Alton Pkwy. |
| Carries | Portola Parkway |
| Crosses | Borrego Canyon Wash |
| Coordinates | 33.68189, -117.66588 |
| Material | Steel |
| Design | Culvert |
| Total Length | 24.0 ft (7.3 m) |
| Max Span | 22.0 ft (6.7 m) |
| Deck Area | 192.7 sq m |
| Main Spans | 1 |
| Year Built | 1990 |
| Avg Daily Traffic | 8,330 (2017) |
| Truck Traffic | 1% |
| Lanes On Bridge | 6 |
| Last Inspection | September 2022 |
| Inspection Frequency | Every 48 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 55C0600 |
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.