US Bridges

ST 4 Bedford ST over I 95 /ST128

Fair

Middlesex County, Massachusetts · At Exit 49 on ST-128 · Structure no. L100142KBDOTNBI

Built
1961
64 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
233 ft
2 main spans
Daily traffic
42,543
2020 count
Owner
State
State Highway Agency

About this bridge

ST 4 Bedford ST over I 95 /ST128 is a steel continuous stringer/multi-beam or girder carrying ST 4 Bedford ST over I 95 /ST128 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 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.

It carries about 42,543 vehicles a day, roughly 5% of them trucks, projected to reach 80,860 by 2033. The structure is 233 ft (71 m) long and 89 ft wide.

Location

Open in Google Maps
CarriesST 4 Bedford ST
CrossesI 95 /ST128
LocationAt Exit 49 on ST-128
RouteState Highway 4
CountyMiddlesex County
StateMassachusetts
Coordinates42.47036, -71.24504
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, 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 inspectionJanuary 2024
Inspection intervalevery 24 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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.4 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadH 20
Structure length233 ft (71 m)
Longest span80 ft (24.4 m)
Deck width89 ft (27 m)
Roadway width78 ft (23.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42,543 (2020)
Projected traffic80,860 by 2033
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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$18.9 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 4 Bedford ST over I 95 /ST128 built?

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

What condition is ST 4 Bedford ST over I 95 /ST128 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 ST 4 Bedford ST over I 95 /ST128 carry?

About 42,543 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is ST 4 Bedford ST over I 95 /ST128?

The structure is 233 ft (71 m) long with a longest span of 80 ft (24.4 m) and a deck 89 ft wide.

Who owns ST 4 Bedford ST over I 95 /ST128?

It is owned by the State Highway Agency.