Structure 20300870010800 · Grafton County, NH
Carries High Bridge Road over Archertown Brook, 150ft W Tillotson RD Jct.
Set by its lowest-rated component: Deck and Superstructure and Substructure at 1 of 9.
How ratings work24 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 | Grafton |
| Location | 150ft W Tillotson RD Jct |
| Carries | High Bridge Road |
| Crosses | Archertown Brook |
| Coordinates | 43.89701, -72.11386 |
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 24.0 ft (7.3 m) |
| Max Span | 23.0 ft (7 m) |
| Deck Width | 14.1 ft (4.3 m) |
| Deck Area | 31.4 sq m |
| Main Spans | 1 |
| Year Built | 1940 |
| Avg Daily Traffic | 96 (2023) |
| Lanes On Bridge | 1 |
| Last Inspection | October 2024 |
| Inspection Frequency | Every 16 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 020300870010800 |
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.