US Bridges

I 495 SB over HWY Tadmuck RD

Fair

Middlesex County, Massachusetts · 0.5 MI N of Boston RD · Structure no. W2602127WDOTNBI

Built
1961
64 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
133 ft
3 main spans
Daily traffic
120,395
2023 count
Owner
State
State Highway Agency

About this bridge

I 495 SB over HWY Tadmuck RD is a steel stringer/multi-beam or girder carrying I 495 SB over HWY Tadmuck RD in Middlesex County, Massachusetts. It was built in 1961, so it is 64 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 120,395 vehicles a day, roughly 10% of them trucks, projected to reach 84,493 by 2031. The structure is 133 ft (40.6 m) long and 57 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesI 495 SB
CrossesHWY Tadmuck RD
Location0.5 MI N of Boston RD
RouteInterstate 495
CountyMiddlesex County
StateMassachusetts
Coordinates42.57773, -71.41208
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating61.9 US tons
Inventory rating37.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length133 ft (40.6 m)
Longest span47 ft (14.3 m)
Deck width57 ft (17.4 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic120,395 (2023)
Projected traffic84,493 by 2031
Trucks10%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$6.9 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 495 SB over HWY Tadmuck RD built?

It was built in 1961, making it 64 years old in 2025.

What condition is I 495 SB over HWY Tadmuck 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 December 2024.

How much traffic does I 495 SB over HWY Tadmuck RD carry?

About 120,395 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is I 495 SB over HWY Tadmuck RD?

The structure is 133 ft (40.6 m) long with a longest span of 47 ft (14.3 m) and a deck 57 ft wide.

Who owns I 495 SB over HWY Tadmuck RD?

It is owned by the State Highway Agency.