Structure 637 · Middlesex County, CT
Carries Routes 9 & 17 over Sumner Brook, Jct Of Rtes 9 & 17.
A culvert 24 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 | Connecticut |
| County | Middlesex |
| Location | Jct Of Rtes 9 & 17 |
| Carries | Routes 9 & 17 |
| Crosses | Sumner Brook |
| Coordinates | 41.55652, -72.64268 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 24.0 ft (7.3 m) |
| Max Span | 24.0 ft (7.3 m) |
| Deck Area | 309.5 sq m |
| Main Spans | 1 |
| Year Built | 1953 |
| Avg Daily Traffic | 55,700 (2022) |
| Truck Traffic | 8% |
| Lanes On Bridge | 6 |
| Last Inspection | November 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 | 00637 |
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.