US Bridges

HWY Forest ST over I 495

Fair

Middlesex County, Massachusetts · @mm 62.5 .6 MI S of US20 · Structure no. M06008217DOTNBI

Built
1963
62 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
250 ft
6 main spans
Daily traffic
3,600
2023 count
Owner
State
State Highway Agency

About this bridge

HWY Forest ST over I 495 is a steel stringer/multi-beam or girder carrying HWY Forest ST over I 495 in Middlesex County, Massachusetts. It was built in 1963, so it is 62 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 3,600 vehicles a day, roughly 6% of them trucks, projected to reach 4,738 by 2032. The structure is 250 ft (76.2 m) long and 50 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesHWY Forest ST
CrossesI 495
Location@mm 62.5 .6 MI S of US20
RouteCity Street 0
CountyMiddlesex County
StateMassachusetts
Coordinates42.33281, -71.57536
Functional classUrban Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.1 US tons
Inventory rating31.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadH 20
Structure length250 ft (76.2 m)
Longest span73 ft (22.3 m)
Deck width50 ft (15.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,600 (2023)
Projected traffic4,738 by 2032
Trucks6%
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$11.4 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Forest ST over I 495 built?

It was built in 1963, making it 62 years old in 2025.

What condition is HWY Forest 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 April 2023.

How much traffic does HWY Forest ST over I 495 carry?

About 3,600 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is HWY Forest ST over I 495?

The structure is 250 ft (76.2 m) long with a longest span of 73 ft (22.3 m) and a deck 50 ft wide.

Who owns HWY Forest ST over I 495?

It is owned by the State Highway Agency.