Structure 8601120007700 · Hillsborough County, NH
Carries Old County RD S over Brennan Brook, Town RD.
Set by its lowest-rated component: Superstructure and Substructure at 5 of 9.
How ratings work23 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 | Hillsborough |
| Location | Town RD |
| Carries | Old County RD S |
| Crosses | Brennan Brook |
| Coordinates | 42.96927, -71.79917 |
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 23.0 ft (7 m) |
| Max Span | 16.1 ft (4.9 m) |
| Deck Width | 20.0 ft (6.1 m) |
| Deck Area | 42.7 sq m |
| Main Spans | 1 |
| Year Built | 1930 (reconstructed 1992) |
| Avg Daily Traffic | 27 (2023) |
| Lanes On Bridge | 1 |
| Last Inspection | October 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 | 008601120007700 |
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.