US Bridges

ST145 Saratoga ST over Water Belle Isle Inlet

Good

Suffolk County, Massachusetts · At Winthrop Town Line · Structure no. B16004B5JMUNNBI

Built
2013
12 years old
Condition
Good
inspected July 2023
Type
Slab
Prestressed Concrete Continuous
Length
204 ft
5 main spans
Daily traffic
34,138
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

ST145 Saratoga ST over Water Belle Isle Inlet is a prestressed concrete continuous slab carrying ST145 Saratoga ST over Water Belle Isle Inlet in Suffolk County, Massachusetts. It was built in 2013, so it is 12 years old, younger than the Massachusetts average of 63.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 34,138 vehicles a day, roughly 4% of them trucks. The structure is 204 ft (62.2 m) long and 60 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesST145 Saratoga ST
CrossesWater Belle Isle Inlet
LocationAt Winthrop Town Line
RouteState Highway 145
CountySuffolk County
StateMassachusetts
Coordinates42.38263, -70.99426
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating73.7 US tons
Inventory rating68.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 25 or greater
Structure length204 ft (62.2 m)
Longest span39 ft (11.8 m)
Deck width60 ft (18.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,138 (2023)
Projected traffic—
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was ST145 Saratoga ST over Water Belle Isle Inlet built?

It was built in 2013, making it 12 years old in 2025.

What condition is ST145 Saratoga ST over Water Belle Isle Inlet in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does ST145 Saratoga ST over Water Belle Isle Inlet carry?

About 34,138 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is ST145 Saratoga ST over Water Belle Isle Inlet?

The structure is 204 ft (62.2 m) long with a longest span of 39 ft (11.8 m) and a deck 60 ft wide.

Who owns ST145 Saratoga ST over Water Belle Isle Inlet?

It is owned by the City or Municipal Highway Agency.