US Bridges

HWY Summer ST over HWY a ST

Fair

Suffolk County, Massachusetts · .16 KM SE Ft Pt Channel · Structure no. B1612438HMUNNBI

Built
1918
107 years old, rebuilt 1993
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
59 ft
1 main span
Daily traffic
17,700
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

HWY Summer ST over HWY a ST is a steel stringer/multi-beam or girder carrying HWY Summer ST over HWY a ST in Suffolk County, Massachusetts. It was built in 1918 and reconstructed in 1993, so it is 107 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 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 17,700 vehicles a day, roughly 12% of them trucks, projected to reach 44,694 by 2033. The structure is 59 ft (18 m) long and 100 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesHWY Summer ST
CrossesHWY a ST
Location.16 KM SE Ft Pt Channel
RouteCity Street 0
CountySuffolk County
StateMassachusetts
Coordinates42.34965, -71.04899
Functional classUrban Other Principal Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating70.3 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length59 ft (18 m)
Longest span53 ft (16.2 m)
Deck width100 ft (30.5 m)
Roadway width78 ft (23.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,700 (2024)
Projected traffic44,694 by 2033
Trucks12%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.7 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Summer ST over HWY a ST built?

It was built in 1918, making it 107 years old in 2025. It was reconstructed in 1993.

What condition is HWY Summer ST over HWY a ST 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 2024.

How much traffic does HWY Summer ST over HWY a ST carry?

About 17,700 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is HWY Summer ST over HWY a ST?

The structure is 59 ft (18 m) long with a longest span of 53 ft (16.2 m) and a deck 100 ft wide.

Who owns HWY Summer ST over HWY a ST?

It is owned by the City or Municipal Highway Agency.