US Bridges

ST 4 North RD over I 495

Fair

Middlesex County, Massachusetts · Rt 4 at Rt 495 · Structure no. C080372K7DOTNBI

Built
1959
66 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
156 ft
2 main spans
Daily traffic
33,500
2015 count
Owner
State
State Highway Agency

About this bridge

ST 4 North RD over I 495 is a steel continuous stringer/multi-beam or girder carrying ST 4 North RD over I 495 in Middlesex County, Massachusetts. It was built in 1959, so it is 66 years old, older 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 33,500 vehicles a day, roughly 7% of them trucks, projected to reach 52,907 by 2032. The structure is 156 ft (47.5 m) long and 53 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesST 4 North RD
CrossesI 495
LocationRt 4 at Rt 495
RouteState Highway 4
CountyMiddlesex County
StateMassachusetts
Coordinates42.60308, -71.35393
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
Deck7 GoodSome minor problems.
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 inspectionSeptember 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 rating87.1 US tons
Inventory rating52.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length156 ft (47.5 m)
Longest span75 ft (22.9 m)
Deck width53 ft (16.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,500 (2015)
Projected traffic52,907 by 2032
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 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$7.6 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 4 North RD over I 495 built?

It was built in 1959, making it 66 years old in 2025.

What condition is ST 4 North RD 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 September 2023.

How much traffic does ST 4 North RD over I 495 carry?

About 33,500 vehicles per day (2015 count), of which roughly 7% are trucks.

How long is ST 4 North RD over I 495?

The structure is 156 ft (47.5 m) long with a longest span of 75 ft (22.9 m) and a deck 53 ft wide.

Who owns ST 4 North RD over I 495?

It is owned by the State Highway Agency.