Structure BCPOS-LOWER BR · Boulder County, CO
Carries Co RD 54a over Middle Boulder Creek, Castle Rock Pull Off.
24 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 | Castle Rock Pull Off |
| Carries | Co RD 54a |
| Crosses | Middle Boulder Creek |
| Coordinates | 39.98127, -105.45413 |
| Material | Concrete |
| Design | Slab |
| Total Length | 23.6 ft (7.2 m) |
| Max Span | 20.3 ft (6.2 m) |
| Deck Width | 22.3 ft (6.8 m) |
| Deck Area | 49.0 sq m |
| Main Spans | 1 |
| Year Built | 1917 |
| Avg Daily Traffic | 70 (2023) |
| Truck Traffic | 4% |
| Lanes On Bridge | 2 |
| Last Inspection | January 2025 |
| Inspection Frequency | Every 24 months |
| Owner | Other Local Agencies |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Scour Critical | 3 — Scour critical |
| Structure Number | BCPOS-LOWER BR |
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.