US Bridges

I 93 /US1/ST3 over HWY Nep Av/Galv/Mrsy

Fair

Suffolk County, Massachusetts · 4.4 MI S of JCT I90&I93 · Structure no. B162513D5DOTNBI

Built
1955
70 years old, rebuilt 1984
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
1,197 ft
19 main spans
Daily traffic
173,365
2023 count
Owner
State
State Highway Agency

About this bridge

I 93 /US1/ST3 over HWY Nep Av/Galv/Mrsy is a steel stringer/multi-beam or girder carrying I 93 /US1/ST3 over HWY Nep Av/Galv/Mrsy in Suffolk County, Massachusetts. It was built in 1955 and reconstructed in 1984, so it is 70 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 173,365 vehicles a day, roughly 7% of them trucks, projected to reach 288,380 by 2032. The structure is 1,197 ft (364.8 m) long and 118 ft wide.

Location

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CarriesI 93 /US1/ST3
CrossesHWY Nep Av/Galv/Mrsy
Location4.4 MI S of JCT I90&I93
RouteInterstate 93
CountySuffolk County
StateMassachusetts
Coordinates42.28577, -71.04292
Functional classUrban Principal Arterial - Interstate

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 2025
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.1 US tons
Inventory rating41.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans19
Design loadHS 20 + Mod
Structure length1,197 ft (364.8 m)
Longest span90 ft (27.4 m)
Deck width118 ft (36 m)
Roadway width110 ft (33.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic173,365 (2023)
Projected traffic288,380 by 2032
Trucks7%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$128 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 93 /US1/ST3 over HWY Nep Av/Galv/Mrsy built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1984.

What condition is I 93 /US1/ST3 over HWY Nep Av/Galv/Mrsy 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 2025.

How much traffic does I 93 /US1/ST3 over HWY Nep Av/Galv/Mrsy carry?

About 173,365 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I 93 /US1/ST3 over HWY Nep Av/Galv/Mrsy?

The structure is 1,197 ft (364.8 m) long with a longest span of 90 ft (27.4 m) and a deck 118 ft wide.

Who owns I 93 /US1/ST3 over HWY Nep Av/Galv/Mrsy?

It is owned by the State Highway Agency.