US Bridges

ST146 NB Off Ramp over Water Blackstone River

Fair

Worcester County, Massachusetts · .1 Mile West of ST 122 · Structure no. M22051AHDDOTNBI

Built
1997
28 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
609 ft
5 main spans
Daily traffic
2,169
2022 count
Owner
State
State Highway Agency

About this bridge

ST146 NB Off Ramp over Water Blackstone River is a steel continuous stringer/multi-beam or girder carrying ST146 NB Off Ramp over Water Blackstone River in Worcester County, Massachusetts. It was built in 1997, so it is 28 years old, younger than the Massachusetts average of 63.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,169 vehicles a day, roughly 6% of them trucks, projected to reach 7,896 by 2032. The structure is 609 ft (185.5 m) long and 25 ft wide.

Location

Open in Google Maps
CarriesST146 NB Off Ramp
CrossesWater Blackstone River
Location.1 Mile West of ST 122
RouteState Highway 146
CountyWorcester County
StateMassachusetts
Coordinates42.20083, -71.77476
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating62.2 US tons
Inventory rating37.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length609 ft (185.5 m)
Longest span133 ft (40.5 m)
Deck width25 ft (7.6 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,169 (2022)
Projected traffic7,896 by 2032
Trucks6%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$29.1 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST146 NB Off Ramp over Water Blackstone River built?

It was built in 1997, making it 28 years old in 2025.

What condition is ST146 NB Off Ramp over Water Blackstone River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2023.

How much traffic does ST146 NB Off Ramp over Water Blackstone River carry?

About 2,169 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is ST146 NB Off Ramp over Water Blackstone River?

The structure is 609 ft (185.5 m) long with a longest span of 133 ft (40.5 m) and a deck 25 ft wide.

Who owns ST146 NB Off Ramp over Water Blackstone River?

It is owned by the State Highway Agency.