Structure M22044AHBDOTNBI · Worcester County, MA
Carries St146 SB Off Ramp over Water Blackstone River, At Exit 17 146sb.
Set by its lowest-rated component: Deck and Substructure at 7 of 9.
How ratings work108 ft end to end. Lengths and the car on the deck are drawn to the same scale. 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 | Massachusetts |
| County | Worcester |
| Location | At Exit 17 146sb |
| Carries | St146 SB Off Ramp |
| Crosses | Water Blackstone River |
| Coordinates | 42.20158, -71.77600 |
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 107.9 ft (32.9 m) |
| Max Span | 107.6 ft (32.8 m) |
| Deck Width | 30.8 ft (9.4 m) |
| Deck Area | 309.3 sq m |
| Main Spans | 1 |
| Year Built | 1998 |
| Avg Daily Traffic | 52,912 (2022) |
| That is about 52,912 vehicles per lane per day — beyond what any U.S. road carries (the busiest freeways run about 25,000–30,000). It is almost certainly a data-entry error in the National Bridge Inventory, so we leave this bridge out of traffic rankings. | |
| Truck Traffic | 6% |
| Lanes On Bridge | 1 |
| Last Inspection | October 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Historical significance is not determined |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | M22044AHBDOTNBI |
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.