US Bridges

I 495 SB over ST135 Wood ST

Fair

Middlesex County, Massachusetts · Mm 55.3 495 SB · Structure no. H230101UUDOTNBI

Built
1966
59 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
61 ft
1 main span
Daily traffic
53,404
2023 count
Owner
State
State Highway Agency

About this bridge

I 495 SB over ST135 Wood ST is a prestressed concrete stringer/multi-beam or girder carrying I 495 SB over ST135 Wood ST in Middlesex County, Massachusetts. It was built in 1966, so it is 59 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 53,404 vehicles a day, roughly 6% of them trucks, projected to reach 78,965 by 2032. The structure is 61 ft (18.6 m) long and 55 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI 495 SB
CrossesST135 Wood ST
LocationMm 55.3 495 SB
RouteInterstate 190
CountyMiddlesex County
StateMassachusetts
Coordinates42.23001, -71.55111
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.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.9 US tons
Inventory rating40.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length61 ft (18.6 m)
Longest span57 ft (17.4 m)
Deck width55 ft (16.9 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic53,404 (2023)
Projected traffic78,965 by 2032
Trucks6%
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 statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.1 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 495 SB over ST135 Wood ST built?

It was built in 1966, making it 59 years old in 2025.

What condition is I 495 SB over ST135 Wood ST 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 I 495 SB over ST135 Wood ST carry?

About 53,404 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I 495 SB over ST135 Wood ST?

The structure is 61 ft (18.6 m) long with a longest span of 57 ft (17.4 m) and a deck 55 ft wide.

Who owns I 495 SB over ST135 Wood ST?

It is owned by the State Highway Agency.