US Bridges

I 93 Strrw DR Con over Water Charles River

Fair

Suffolk County, Massachusetts · I93/US1 Interchange · Structure no. B166069P9DOTNBI

Built
1999
26 years old
Condition
Fair
inspected May 2022
Type
Box Beam or Girders - Multiple
Steel Continuous
Length
830 ft
3 main spans
Daily traffic
74,323
2019 count
Owner
State
State Highway Agency

About this bridge

I 93 Strrw DR Con over Water Charles River is a steel continuous box beam or girders - multiple carrying I 93 Strrw DR Con over Water Charles River in Suffolk County, Massachusetts. It was built in 1999, so it is 26 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 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 74,323 vehicles a day, roughly 4% of them trucks, projected to reach 98,232 by 2031. The structure is 830 ft (253 m) long and 76 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesI 93 Strrw DR Con
CrossesWater Charles River
LocationI93/US1 Interchange
RouteInterstate 93
CountySuffolk County
StateMassachusetts
Coordinates42.36903, -71.06452
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.5 US tons
Inventory rating48.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length830 ft (253 m)
Longest span380 ft (115.8 m)
Deck width76 ft (23.2 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deck16 ft (4.8 m)

Traffic and service

Average daily traffic74,323 (2019)
Projected traffic98,232 by 2031
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad and waterway
Detour if closed3.7 mi (6 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 statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$15.4 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I 93 Strrw DR Con over Water Charles River built?

It was built in 1999, making it 26 years old in 2025.

What condition is I 93 Strrw DR Con over Water Charles River 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 May 2022.

How much traffic does I 93 Strrw DR Con over Water Charles River carry?

About 74,323 vehicles per day (2019 count), of which roughly 4% are trucks.

How long is I 93 Strrw DR Con over Water Charles River?

The structure is 830 ft (253 m) long with a longest span of 380 ft (115.8 m) and a deck 76 ft wide.

Who owns I 93 Strrw DR Con over Water Charles River?

It is owned by the State Highway Agency.