Structure U05809002+02701 · Lewis and Clark County, MT
Carries N Montana AVE over Helena Valley Canal, 1m N Helena.
25 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 | Montana |
| County | Lewis and Clark |
| Location | 1m N Helena |
| Carries | N Montana AVE |
| Crosses | Helena Valley Canal |
| Coordinates | 46.62864, -112.02117 |
| Material | Concrete |
| Design | Slab |
| Total Length | 24.6 ft (7.5 m) |
| Max Span | 23.3 ft (7.1 m) |
| Deck Width | 56.4 ft (17.2 m) |
| Deck Area | 129 sq m |
| Main Spans | 1 |
| Year Built | 1958 (reconstructed 2005) |
| Avg Daily Traffic | 11,167 (2023) |
| Truck Traffic | 1% |
| Lanes On Bridge | 2 |
| Last Inspection | December 2024 |
| 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 | U05809002+02701 |
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.