US Bridges

HWY Lowell Conn over HWY Thorndike ST

Fair

Middlesex County, Massachusetts · .16 KM SE Rt 3A & Hale ST · Structure no. L150792HFDOTNBI

Built
1960
65 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
67 ft
1 main span
Daily traffic
35,900
2020 count
Owner
State
State Highway Agency

About this bridge

HWY Lowell Conn over HWY Thorndike ST is a steel stringer/multi-beam or girder carrying HWY Lowell Conn over HWY Thorndike ST in Middlesex County, Massachusetts. It was built in 1960, so it is 65 years old, older 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. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 35,900 vehicles a day, roughly 3% of them trucks, projected to reach 47,995 by 2033. The structure is 67 ft (20.5 m) long and 99 ft wide.

CarriesHWY Lowell Conn
CrossesHWY Thorndike ST
Location.16 KM SE Rt 3A & Hale ST
Coordinates42.63433, -71.31081
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.6 US tons
Inventory rating37.1 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length67 ft (20.5 m)
Longest span63 ft (19.2 m)
Deck width99 ft (30.2 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,900 (2020)
Projected traffic47,995 by 2033
Trucks3%
Lanes on structure5
Traffic directionTwo-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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$6.2 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Lowell Conn over HWY Thorndike ST built?

It was built in 1960, making it 65 years old in 2025.

What condition is HWY Lowell Conn over HWY Thorndike 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 January 2024.

How much traffic does HWY Lowell Conn over HWY Thorndike ST carry?

About 35,900 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is HWY Lowell Conn over HWY Thorndike ST?

The structure is 67 ft (20.5 m) long with a longest span of 63 ft (19.2 m) and a deck 99 ft wide.

Who owns HWY Lowell Conn over HWY Thorndike ST?

It is owned by the State Highway Agency.