Structure 4P0002 · Humboldt County, CA
Carries State Park Road over Upper Durphy Creek, Richardson Grove St. Pk..
A culvert 23 ft across with 3 openings. 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 | Humboldt |
| Location | Richardson Grove St. Pk. |
| Carries | State Park Road |
| Crosses | Upper Durphy Creek |
| Coordinates | 40.02062, -123.79407 |
| Material | Steel |
| Design | Culvert |
| Total Length | 23.3 ft (7.1 m) |
| Max Span | 10.5 ft (3.2 m) |
| Deck Width | 32.5 ft (9.9 m) |
| Deck Area | 70.3 sq m |
| Main Spans | 3 |
| Year Built | 1965 |
| Avg Daily Traffic | 300 (1982) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
| Last Inspection | July 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Park/Forest Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | Unknown |
| Structure Number | 04P0002 |
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.