US Bridges

I 495 SB over ST225 Concord RD

Fair

Middlesex County, Massachusetts · @mm 81.7 · Structure no. W2601827RDOTNBI

Built
1959
66 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
128 ft
3 main spans
Daily traffic
59,452
2023 count
Owner
State
State Highway Agency

About this bridge

I 495 SB over ST225 Concord RD is a steel stringer/multi-beam or girder carrying I 495 SB over ST225 Concord RD 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 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 59,452 vehicles a day, roughly 12% of them trucks, projected to reach 69,489 by 2031. The structure is 128 ft (39 m) long and 58 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI 495 SB
CrossesST225 Concord RD
Location@mm 81.7
RouteInterstate 495
CountyMiddlesex County
StateMassachusetts
Coordinates42.55604, -71.44991
Functional classUrban Principal Arterial - Interstate

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.2 US tons
Inventory rating40.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length128 ft (39 m)
Longest span56 ft (17.1 m)
Deck width58 ft (17.7 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic59,452 (2023)
Projected traffic69,489 by 2031
Trucks12%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$3 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 495 SB over ST225 Concord RD built?

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

What condition is I 495 SB over ST225 Concord RD 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 November 2024.

How much traffic does I 495 SB over ST225 Concord RD carry?

About 59,452 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is I 495 SB over ST225 Concord RD?

The structure is 128 ft (39 m) long with a longest span of 56 ft (17.1 m) and a deck 58 ft wide.

Who owns I 495 SB over ST225 Concord RD?

It is owned by the State Highway Agency.