US Bridges

ST111 Mass Ave over I 495

Poor

Middlesex County, Massachusetts · Mm 74.6 · Structure no. B1800228LDOTNBI

Built
1963
62 years old
Condition
Poor
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
323 ft
3 main spans
Daily traffic
4,604
2022 count
Owner
State
State Highway Agency

About this bridge

ST111 Mass Ave over I 495 is a steel continuous stringer/multi-beam or girder carrying ST111 Mass Ave over I 495 in Middlesex County, Massachusetts. It was built in 1963, so it is 62 years old, younger 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 3 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 4,604 vehicles a day, roughly 6% of them trucks, projected to reach 28,743 by 2032. The structure is 323 ft (98.5 m) long and 56 ft wide. If it were closed, the detour would be 4.3 mi (7 km).

Location

Open in Google Maps
CarriesST111 Mass Ave
CrossesI 495
LocationMm 74.6
RouteState Highway 111
CountyMiddlesex County
StateMassachusetts
Coordinates42.487, -71.54488
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
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 6 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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating34.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadH 20
Structure length323 ft (98.5 m)
Longest span95 ft (29 m)
Deck width56 ft (17.1 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,604 (2022)
Projected traffic28,743 by 2032
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed4.3 mi (7 km)
TollOn a free road
National Highway SystemNo

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$16.5 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST111 Mass Ave over I 495 built?

It was built in 1963, making it 62 years old in 2025.

What condition is ST111 Mass Ave 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 April 2023.

How much traffic does ST111 Mass Ave over I 495 carry?

About 4,604 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is ST111 Mass Ave over I 495?

The structure is 323 ft (98.5 m) long with a longest span of 95 ft (29 m) and a deck 56 ft wide.

Who owns ST111 Mass Ave over I 495?

It is owned by the State Highway Agency.