Structure 6 0109 · Shasta County, CA
Carries State Route 273 over Boulder Creek, 02-sha-273-19.09.
A culvert 21 ft across with 2 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 | Shasta |
| Location | 02-sha-273-19.09 |
| Carries | State Route 273 |
| Crosses | Boulder Creek |
| Coordinates | 40.61576, -122.37437 |
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 21.3 ft (6.5 m) |
| Max Span | 10.2 ft (3.1 m) |
| Deck Area | 208 sq m |
| Main Spans | 2 |
| Year Built | 1953 |
| Avg Daily Traffic | 12,800 (2020) |
| Truck Traffic | 9% |
| Lanes On Bridge | 4 |
| Last Inspection | April 2023 |
| 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 | 06 0109 |
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.