US Bridges

HWY NB Lowll Con over HWY Plain ST

Good

Middlesex County, Massachusetts · 1.2 Miles N. of I495 · Structure no. L15072B55DOTNBI

Built
2012
13 years old
Condition
Good
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
148 ft
3 main spans
Daily traffic
21,008
2025 count
Owner
State
State Highway Agency

About this bridge

HWY NB Lowll Con over HWY Plain ST is a steel continuous stringer/multi-beam or girder carrying HWY NB Lowll Con over HWY Plain ST in Middlesex County, Massachusetts. It was built in 2012, so it is 13 years old, younger than the Massachusetts average of 63.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 21,008 vehicles a day, roughly 10% of them trucks. The structure is 148 ft (45.1 m) long and 61 ft wide.

CarriesHWY NB Lowll Con
CrossesHWY Plain ST
Location1.2 Miles N. of I495
RouteCity Street 0
Coordinates42.62521, -71.31996
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating73.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length148 ft (45.1 m)
Longest span65 ft (19.8 m)
Deck width61 ft (18.7 m)
Roadway width58 ft (17.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,008 (2025)
Projected traffic—
Trucks10%
Lanes on structure3
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 statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$862,000 (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY NB Lowll Con over HWY Plain ST built?

It was built in 2012, making it 13 years old in 2025.

What condition is HWY NB Lowll Con over HWY Plain ST in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2024.

How much traffic does HWY NB Lowll Con over HWY Plain ST carry?

About 21,008 vehicles per day (2025 count), of which roughly 10% are trucks.

How long is HWY NB Lowll Con over HWY Plain ST?

The structure is 148 ft (45.1 m) long with a longest span of 65 ft (19.8 m) and a deck 61 ft wide.

Who owns HWY NB Lowll Con over HWY Plain ST?

It is owned by the State Highway Agency.