Structure D13001BLGMUNNBI · Middlesex County, MA
Carries HWY Main ST over Water Salmon Brook, .5 Mi. N. Of RTE 113.
Set by its lowest-rated component: Superstructure and Substructure at 8 of 9.
How ratings work22 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 rigid-frame bridge.
| State | Massachusetts |
| County | Middlesex |
| Location | .5 Mi. N. Of RTE 113 |
| Carries | HWY Main ST |
| Crosses | Water Salmon Brook |
| Coordinates | 42.67820, -71.49340 |
| Material | Concrete |
| Design | Frame |
| Total Length | 22.0 ft (6.7 m) |
| Max Span | 21.7 ft (6.6 m) |
| Deck Width | 30.8 ft (9.4 m) |
| Deck Area | 63.0 sq m |
| Main Spans | 1 |
| Year Built | 2014 |
| Avg Daily Traffic | 2,700 (2024) |
| Truck Traffic | 9% |
| Lanes On Bridge | 2 |
| Last Inspection | November 2024 |
| Inspection Frequency | Every 24 months |
| Owner | Town/Township Highway Agency |
| Historical Significance | Historical significance is not determined |
| Scour Critical | 5 — Stable for scour |
| Structure Number | D13001BLGMUNNBI |
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.