US Bridges

I 93 & Rmp Sa-Cn over Water Charles Riv/Ramps

Fair

Suffolk County, Massachusetts · N of Td Garden · Structure no. B166009PMDOTNBI

Built
2002
23 years old
Condition
Fair
inspected October 2023
Type
Stayed Girder
Steel
Length
1,457 ft
5 main spans
Daily traffic
155,200
2019 count
Owner
State
State Highway Agency

About this bridge

I 93 & Rmp Sa-Cn over Water Charles Riv/Ramps is a steel stayed girder carrying I 93 & Rmp Sa-Cn over Water Charles Riv/Ramps in Suffolk County, Massachusetts. It was built in 2002, so it is 23 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 155,200 vehicles a day, roughly 8% of them trucks, projected to reach 245,107 by 2032. The structure is 1,457 ft (444.2 m) long and 183 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 93 & Rmp Sa-Cn
CrossesWater Charles Riv/Ramps
LocationN of Td Garden
RouteInterstate 93
CountySuffolk County
StateMassachusetts
Coordinates42.3688, -71.06323
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 alignment6: Equal to present minimum criteria
Operating rating50 US tons
Inventory rating43.5 US tons

Structure

Structure typeStayed Girder
MaterialSteel
DeckConcrete, precast panels
Main spans5
Design loadHS 25 or greater
Structure length1,457 ft (444.2 m)
Longest span745 ft (227.1 m)
Deck width183 ft (55.9 m)
Roadway width144 ft (43.9 m)
Vertical clearance over deck15 ft (4.7 m)

Traffic and service

Average daily traffic155,200 (2019)
Projected traffic245,107 by 2032
Trucks8%
Lanes on structure10
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 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 statusEligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$242.2 million (2025 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I 93 & Rmp Sa-Cn over Water Charles Riv/Ramps built?

It was built in 2002, making it 23 years old in 2025.

What condition is I 93 & Rmp Sa-Cn over Water Charles Riv/Ramps 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 October 2023.

How much traffic does I 93 & Rmp Sa-Cn over Water Charles Riv/Ramps carry?

About 155,200 vehicles per day (2019 count), of which roughly 8% are trucks.

How long is I 93 & Rmp Sa-Cn over Water Charles Riv/Ramps?

The structure is 1,457 ft (444.2 m) long with a longest span of 745 ft (227.1 m) and a deck 183 ft wide.

Who owns I 93 & Rmp Sa-Cn over Water Charles Riv/Ramps?

It is owned by the State Highway Agency.