US Bridges

HWY Boston ST over I 93 /US1/ST3

Fair

Suffolk County, Massachusetts · 2.4 KM S of JCT I90&93 · Structure no. B162663F7DOTNBI

Built
1958
67 years old, rebuilt 1987
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
153 ft
2 main spans
Daily traffic
14,500
2024 count
Owner
State
State Highway Agency

About this bridge

HWY Boston ST over I 93 /US1/ST3 is a steel stringer/multi-beam or girder carrying HWY Boston ST over I 93 /US1/ST3 in Suffolk County, Massachusetts. It was built in 1958 and reconstructed in 1987, so it is 67 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 6 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 14,500 vehicles a day, roughly 3% of them trucks, projected to reach 26,690 by 2031. The structure is 153 ft (46.6 m) long and 62 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesHWY Boston ST
CrossesI 93 /US1/ST3
Location2.4 KM S of JCT I90&93
RouteCity Street 0
CountySuffolk County
StateMassachusetts
Coordinates42.32718, -71.0583
Functional classUrban Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.7 US tons
Inventory rating63.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length153 ft (46.6 m)
Longest span73 ft (22.3 m)
Deck width62 ft (18.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,500 (2024)
Projected traffic26,690 by 2031
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$10.9 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Boston ST over I 93 /US1/ST3 built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1987.

What condition is HWY Boston ST over I 93 /US1/ST3 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 November 2024.

How much traffic does HWY Boston ST over I 93 /US1/ST3 carry?

About 14,500 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is HWY Boston ST over I 93 /US1/ST3?

The structure is 153 ft (46.6 m) long with a longest span of 73 ft (22.3 m) and a deck 62 ft wide.

Who owns HWY Boston ST over I 93 /US1/ST3?

It is owned by the State Highway Agency.