US Bridges

ST106 Green ST over I 495

Fair

Norfolk County, Massachusetts · .4 MI W.Of Manfield Tl · Structure no. F060263W0DOTNBI

Built
1965
60 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
310 ft
3 main spans
Daily traffic
9,143
2023 count
Owner
State
State Highway Agency

About this bridge

ST106 Green ST over I 495 is a steel stringer/multi-beam or girder carrying ST106 Green ST over I 495 in Norfolk County, Massachusetts. It was built in 1965, so it is 60 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 5 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 9,143 vehicles a day, roughly 3% of them trucks, projected to reach 27,322 by 2032. The structure is 310 ft (94.5 m) long and 53 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesST106 Green ST
CrossesI 495
Location.4 MI W.Of Manfield Tl
RouteState Highway 106
CountyNorfolk County
StateMassachusetts
Coordinates42.02982, -71.26485
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.3 US tons
Inventory rating33.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length310 ft (94.5 m)
Longest span112 ft (34.1 m)
Deck width53 ft (16.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,143 (2023)
Projected traffic27,322 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$15 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST106 Green ST over I 495 built?

It was built in 1965, making it 60 years old in 2025.

What condition is ST106 Green ST over I 495 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 August 2023.

How much traffic does ST106 Green ST over I 495 carry?

About 9,143 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is ST106 Green ST over I 495?

The structure is 310 ft (94.5 m) long with a longest span of 112 ft (34.1 m) and a deck 53 ft wide.

Who owns ST106 Green ST over I 495?

It is owned by the State Highway Agency.