Structure 53C0579 · Los Angeles County, CA
Carries Brea Cyn RD over Diamond Bar Crk, 0.2mi N/o Lycoming ST.
A culvert 21 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 | Los Angeles |
| Location | 0.2mi N/o Lycoming ST |
| Carries | Brea Cyn RD |
| Crosses | Diamond Bar Crk |
| Coordinates | 34.00356, -117.84634 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 21.0 ft (6.4 m) |
| Max Span | 15.1 ft (4.6 m) |
| Deck Width | 100.7 ft (30.7 m) |
| Deck Area | 196.5 sq m |
| Main Spans | 1 |
| Year Built | 1980 (reconstructed 1983) |
| Avg Daily Traffic | 16,135 (2012) |
| Truck Traffic | 2% |
| Lanes On Bridge | 4 |
| Last Inspection | September 2021 |
| 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 | 53C0579 |
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.