Structure F-16-JJ · Jefferson County, CO
Carries SH 121 Ml over Sanderson Gulch, Just S. Of Jewell Ave..
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 | Colorado |
| County | Jefferson |
| Location | Just S. Of Jewell Ave. |
| Carries | SH 121 Ml |
| Crosses | Sanderson Gulch |
| Coordinates | 39.68109, -105.08131 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 21.7 ft (6.6 m) |
| Max Span | 10.5 ft (3.2 m) |
| Deck Width | 111.5 ft (34 m) |
| Deck Area | 224.4 sq m |
| Main Spans | 2 |
| Year Built | 1976 (reconstructed 1986) |
| Avg Daily Traffic | 42,000 (2020) |
| Truck Traffic | 2% |
| Lanes On Bridge | 6 |
| Last Inspection | January 2025 |
| 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 | F-16-JJ |
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.