US Bridges

HWY SB Lowll Con over I 495

Poor

Middlesex County, Massachusetts · 1 MI E of ST-110 · Structure no. L150652H3DOTNBI

Built
1959
66 years old
Condition
Poor
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
215 ft
2 main spans
Daily traffic
11,013
2024 count
Owner
State
State Highway Agency

About this bridge

HWY SB Lowll Con over I 495 is a steel stringer/multi-beam or girder carrying HWY SB Lowll Con over I 495 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 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 11,013 vehicles a day, roughly 12% of them trucks, projected to reach 44,220 by 2031. The structure is 215 ft (65.6 m) long and 48 ft wide.

Location

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CarriesHWY SB Lowll Con
CrossesI 495
Location1 MI E of ST-110
CountyMiddlesex County
StateMassachusetts
Coordinates42.60796, -71.32053
Functional classUrban Principal Arterial - Other Freeway or Expressway

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
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 inspectionJune 2024
Inspection intervalevery 12 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 geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54.6 US tons
Inventory rating36.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length215 ft (65.6 m)
Longest span103 ft (31.5 m)
Deck width48 ft (14.6 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,013 (2024)
Projected traffic44,220 by 2031
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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$9.4 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY SB Lowll Con over I 495 built?

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

What condition is HWY SB Lowll Con 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 June 2024.

How much traffic does HWY SB Lowll Con over I 495 carry?

About 11,013 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is HWY SB Lowll Con over I 495?

The structure is 215 ft (65.6 m) long with a longest span of 103 ft (31.5 m) and a deck 48 ft wide.

Who owns HWY SB Lowll Con over I 495?

It is owned by the State Highway Agency.