Structure L2257 · Rock County, MN
Carries M 75 over Stream, 0.5 Mi S Of Jct Csah 4.
Set by its lowest-rated component: Superstructure and Substructure at 5 of 9.
How ratings work21 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 deck arch.
| State | Minnesota |
| County | Rock |
| Location | 0.5 Mi S Of Jct Csah 4 |
| Carries | M 75 |
| Crosses | Stream |
| Coordinates | 43.64841, -96.19461 |
| Material | Concrete |
| Design | Arch - Deck |
| Total Length | 21.0 ft (6.4 m) |
| Max Span | 17.7 ft (5.4 m) |
| Deck Width | 17.7 ft (5.4 m) |
| Deck Area | 34.6 sq m |
| Main Spans | 1 |
| Year Built | 1910 |
| Avg Daily Traffic | 297 (2022) |
| Lanes On Bridge | 1 |
| Last Inspection | October 2023 |
| Inspection Frequency | Every 24 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | L2257 |
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.