US Bridges

ST107 Broadway over Water Diamond Creek

Fair

Suffolk County, Massachusetts · 1.6 KM N of ST 60 · Structure no. R05009A96DOTNBI

Built
2011
14 years old
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
66 ft
1 main span
Daily traffic
33,103
2019 count
Owner
State
State Highway Agency

About this bridge

ST107 Broadway over Water Diamond Creek is a prestressed concrete box beam or girders - single or spread carrying ST107 Broadway over Water Diamond Creek in Suffolk County, Massachusetts. It was built in 2011, so it is 14 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 33,103 vehicles a day, roughly 10% of them trucks, projected to reach 50,222 by 2032. The structure is 66 ft (20 m) long and 78 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesST107 Broadway
CrossesWater Diamond Creek
Location1.6 KM N of ST 60
CountySuffolk County
StateMassachusetts
Coordinates42.42829, -70.99935
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating103.3 US tons
Inventory rating61.8 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length66 ft (20 m)
Longest span60 ft (18.2 m)
Deck width78 ft (23.9 m)
Roadway width70 ft (21.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,103 (2019)
Projected traffic50,222 by 2032
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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$376,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST107 Broadway over Water Diamond Creek built?

It was built in 2011, making it 14 years old in 2025.

What condition is ST107 Broadway over Water Diamond Creek 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 July 2023.

How much traffic does ST107 Broadway over Water Diamond Creek carry?

About 33,103 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is ST107 Broadway over Water Diamond Creek?

The structure is 66 ft (20 m) long with a longest span of 60 ft (18.2 m) and a deck 78 ft wide.

Who owns ST107 Broadway over Water Diamond Creek?

It is owned by the State Highway Agency.