Structure 91991 · Norman County, MN
Carries CR 100 over Ditch, 0.8 Mi W Of Jct Csah 36.
A culvert 23 ft across with 2 openings. 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 | Norman |
| Location | 0.8 Mi W Of Jct Csah 36 |
| Carries | CR 100 |
| Crosses | Ditch |
| Coordinates | 47.49960, -96.14854 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 22.6 ft (6.9 m) |
| Max Span | 8.5 ft (2.6 m) |
| Deck Area | 62.8 sq m |
| Main Spans | 2 |
| Year Built | 1978 |
| Avg Daily Traffic | 35 (2008) |
| Lanes On Bridge | 2 |
| Last Inspection | September 2022 |
| Inspection Frequency | Every 48 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 91991 |
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.