US Bridges

I 495 NB on Ramp over I 495 & Ramp D

Fair

Middlesex County, Massachusetts · .5 MI N of Southboro T.L. · Structure no. M06022AM2DOTNBI

Built
2000
25 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Single or Spread
Steel Continuous
Length
577 ft
4 main spans
Daily traffic
4,963
2022 count
Owner
State
State Highway Agency

About this bridge

I 495 NB on Ramp over I 495 & Ramp D is a steel continuous box beam or girders - single or spread carrying I 495 NB on Ramp over I 495 & Ramp D in Middlesex County, Massachusetts. It was built in 2000, so it is 25 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 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 4,963 vehicles a day, roughly 6% of them trucks, projected to reach 15,793 by 2032. The structure is 577 ft (175.9 m) long and 26 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI 495 NB on Ramp
CrossesI 495 & Ramp D
Location.5 MI N of Southboro T.L.
RouteInterstate 495
CountyMiddlesex County
StateMassachusetts
Coordinates42.32049, -71.57091
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating68.2 US tons
Inventory rating40.9 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length577 ft (175.9 m)
Longest span159 ft (48.5 m)
Deck width26 ft (7.8 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,963 (2022)
Projected traffic15,793 by 2032
Trucks6%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$4.9 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 495 NB on Ramp over I 495 & Ramp D built?

It was built in 2000, making it 25 years old in 2025.

What condition is I 495 NB on Ramp over I 495 & Ramp D 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 June 2023.

How much traffic does I 495 NB on Ramp over I 495 & Ramp D carry?

About 4,963 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is I 495 NB on Ramp over I 495 & Ramp D?

The structure is 577 ft (175.9 m) long with a longest span of 159 ft (48.5 m) and a deck 26 ft wide.

Who owns I 495 NB on Ramp over I 495 & Ramp D?

It is owned by the State Highway Agency.