US Bridges

HWY Boylston ST over I 495

Poor

Middlesex County, Massachusetts · 1.3 KM South Rt 38 · Structure no. L150852L7DOTNBI

Built
1961
64 years old
Condition
Poor
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
285 ft
5 main spans
Daily traffic
10,600
2024 count
Owner
State
State Highway Agency

About this bridge

HWY Boylston ST over I 495 is a steel stringer/multi-beam or girder carrying HWY Boylston ST over I 495 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 10,600 vehicles a day, roughly 4% of them trucks, projected to reach 15,161 by 2031. The structure is 285 ft (86.9 m) long and 50 ft wide.

Location

Open in Google Maps
CarriesHWY Boylston ST
CrossesI 495
Location1.3 KM South Rt 38
RouteCity Street 0
CountyMiddlesex County
StateMassachusetts
Coordinates42.62143, -71.28271
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.2 US tons
Inventory rating29.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length285 ft (86.9 m)
Longest span74 ft (22.6 m)
Deck width50 ft (15.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,600 (2024)
Projected traffic15,161 by 2031
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$20.5 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Boylston ST over I 495 built?

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

What condition is HWY Boylston ST over I 495 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.

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

About 10,600 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is HWY Boylston ST over I 495?

The structure is 285 ft (86.9 m) long with a longest span of 74 ft (22.6 m) and a deck 50 ft wide.

Who owns HWY Boylston ST over I 495?

It is owned by the State Highway Agency.