Structure 6600860008400 · Cheshire County, NH
Carries Old Troy Road over Brook, 2.25mi. Marlboro Tl.
Set by its lowest-rated component: Superstructure and Substructure at 5 of 9.
How ratings work25 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 multi-beam bridge.
| State | New Hampshire |
| County | Cheshire |
| Location | 2.25mi. Marlboro Tl |
| Carries | Old Troy Road |
| Crosses | Brook |
| Coordinates | 42.89122, -72.10371 |
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 24.9 ft (7.6 m) |
| Max Span | 21.0 ft (6.4 m) |
| Deck Width | 18.0 ft (5.5 m) |
| Deck Area | 41.8 sq m |
| Main Spans | 1 |
| Year Built | 1940 (reconstructed 1991) |
| Avg Daily Traffic | 96 (2023) |
| Lanes On Bridge | 2 |
| Last Inspection | August 2024 |
| Inspection Frequency | Every 24 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 006600860008400 |
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.