US Bridges

I 93 NB B10-B16 over I 93 SB B10-B16

Fair

Suffolk County, Massachusetts · 1.0 MI N of JCT I93 & US1 · Structure no. B162813E1DOTNBI

Built
1970
55 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
456 ft
6 main spans
Daily traffic
58,882
2022 count
Owner
State
State Highway Agency

About this bridge

I 93 NB B10-B16 over I 93 SB B10-B16 is a steel stringer/multi-beam or girder carrying I 93 NB B10-B16 over I 93 SB B10-B16 in Suffolk County, Massachusetts. It was built in 1970, so it is 55 years old, younger 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 58,882 vehicles a day, roughly 8% of them trucks, projected to reach 120,343 by 2032. The structure is 456 ft (139 m) long and 69 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

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CarriesI 93 NB B10-B16
CrossesI 93 SB B10-B16
Location1.0 MI N of JCT I93 & US1
RouteInterstate 93
CountySuffolk County
StateMassachusetts
Coordinates42.38236, -71.07661
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating64.7 US tons
Inventory rating38.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length456 ft (139 m)
Longest span79 ft (24.1 m)
Deck width69 ft (21 m)
Roadway width62 ft (18.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic58,882 (2022)
Projected traffic120,343 by 2032
Trucks8%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed5.6 mi (9 km)
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 proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$13.7 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 93 NB B10-B16 over I 93 SB B10-B16 built?

It was built in 1970, making it 55 years old in 2025.

What condition is I 93 NB B10-B16 over I 93 SB B10-B16 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 April 2023.

How much traffic does I 93 NB B10-B16 over I 93 SB B10-B16 carry?

About 58,882 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is I 93 NB B10-B16 over I 93 SB B10-B16?

The structure is 456 ft (139 m) long with a longest span of 79 ft (24.1 m) and a deck 69 ft wide.

Who owns I 93 NB B10-B16 over I 93 SB B10-B16?

It is owned by the State Highway Agency.