Structure 9683 · Maricopa County, AZ
Carries Thunderbird RD over Drainage Ditch, At 99th AVE Median.
A culvert 22 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 | Arizona |
| County | Maricopa |
| Location | At 99th AVE Median |
| Carries | Thunderbird RD |
| Crosses | Drainage Ditch |
| Coordinates | 33.60932, -112.26795 |
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 22.0 ft (6.7 m) |
| Max Span | 11.2 ft (3.4 m) |
| Deck Width | 89.9 ft (27.4 m) |
| Deck Area | 183.6 sq m |
| Main Spans | 2 |
| Year Built | 1972 (reconstructed 1997) |
| Avg Daily Traffic | 24,345 (2020) |
| Truck Traffic | 10% |
| Lanes On Bridge | 6 |
| Last Inspection | December 2022 |
| Inspection Frequency | Every 36 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 09683 |
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.