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ST146 /ST122A/NB over Water Blackstone River

Worcester County, Massachusetts · rated Good in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

ST146 /ST122A/NB over Water Blackstone River in Worcester County, Massachusetts, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 1997, making it 28 years old at the 2025 inventory.
It carries about 21,856 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 264 of the 1,020 inventoried bridges in Worcester County rated good (25.9%); 78 (7.6%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Continuous steel stringer or multi-beam girder
Length	about 250 ft
Location	.4 M. N. of Millbury T.l.
NBI structure number	W44146AHGDOTNBI
Condition class	Good

Source: FHWA National Bridge Inventory, 2025 data as reported by the Massachusetts department of transportation.

Bridge	Built	Vehicles/day	Condition
I 90 over Water Blackstone River	1957	130,647	Fair
I 290 over Hwy Seymour St	1959	126,972	Fair
I 290 over Hwy Endicott St	1959	126,870	Fair
I 290 & Ramps over Hwy Prospect St	1958	114,878	Fair
I 90 over Water French River	1957	104,900	Fair
I 290 over ST146 Millbury St	2007	96,092	Good