ST117 Main St over I 95 /ST128
Middlesex County, Massachusetts · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- ST117 Main St over I 95 /ST128 in Middlesex County, Massachusetts, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- It was built in 1962, making it 63 years old at the 2025 inventory.
- It carries about 18,600 vehicles a day (traffic count year 2018).
- Its listed owner is the state highway agency.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (42.3767, -71.26654)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 4 | Poor condition |
| Superstructure | 5 | Fair condition |
| Substructure | 3 | Serious condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 217 ft |
| Location | 0.5 Mi Nly Rt 20 |
| NBI structure number | W040282K3DOTNBI |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Massachusetts department of transportation.
All bridges nearby: Middlesex County, MA bridge conditions · Massachusetts bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.