Structure BOLD-04-0.39-03 · Boulder County, CO
Carries Folsom Street over Boulder Whiterock Ditch, 20 Ft N Of Pearl Street.
Set by its lowest-rated component: Deck and Superstructure at 6 of 9.
How ratings work23 ft end to end. 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 or the layout of the shorter spans, so those are drawn as typical for a slab bridge.
| State | Colorado |
| County | Boulder |
| Location | 20 Ft N Of Pearl Street |
| Carries | Folsom Street |
| Crosses | Boulder Whiterock Ditch |
| Coordinates | 40.02154, -105.26302 |
| Material | Concrete |
| Design | Slab |
| Total Length | 23.0 ft (7 m) |
| Max Span | 22.0 ft (6.7 m) |
| Deck Width | 78.1 ft (23.8 m) |
| Deck Area | 166.6 sq m |
| Main Spans | 1 |
| Year Built | 1970 |
| Avg Daily Traffic | 13,574 (2023) |
| Truck Traffic | 5% |
| Lanes On Bridge | 5 |
| Last Inspection | February 2025 |
| Inspection Frequency | Every 24 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | BOLD-04-0.39-03 |
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.