Structure L4171 · St. Louis County, MN
Carries Msas 199 over E Swan River, 3.3 Mi E Of Jct Th169.
A culvert 25 ft across. 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 | Minnesota |
| County | St. Louis |
| Location | 3.3 Mi E Of Jct Th169 |
| Carries | Msas 199 |
| Crosses | E Swan River |
| Coordinates | 47.41611, -92.85271 |
| Material | Steel |
| Design | Culvert |
| Total Length | 24.6 ft (7.5 m) |
| Max Span | 24.6 ft (7.5 m) |
| Deck Area | 82.5 sq m |
| Main Spans | 1 |
| Year Built | 1959 |
| Avg Daily Traffic | 375 (2022) |
| Truck Traffic | 12% |
| Lanes On Bridge | 2 |
| Last Inspection | September 2023 |
| 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 | L4171 |
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.