US Bridges

HWY South ST over Water Stony Brook

Fair

Middlesex County, Massachusetts · At Weston Line · Structure no. W04008AL5MUNNBI

Built
2003
22 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
66 ft
1 main span
Daily traffic
16,293
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

HWY South ST over Water Stony Brook is a steel stringer/multi-beam or girder carrying HWY South ST over Water Stony Brook in Middlesex County, Massachusetts. It was built in 2003, so it is 22 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 16,293 vehicles a day, roughly 4% of them trucks, projected to reach 15,316 by 2032. The structure is 66 ft (20.1 m) long and 42 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesHWY South ST
CrossesWater Stony Brook
LocationAt Weston Line
RouteCity Street 0
CountyMiddlesex County
StateMassachusetts
Coordinates42.35448, -71.26332
Functional classUrban Minor 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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.5 US tons
Inventory rating54.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length66 ft (20.1 m)
Longest span63 ft (19.2 m)
Deck width42 ft (12.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,293 (2019)
Projected traffic15,316 by 2032
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$2.1 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY South ST over Water Stony Brook built?

It was built in 2003, making it 22 years old in 2025.

What condition is HWY South ST over Water Stony Brook 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 HWY South ST over Water Stony Brook carry?

About 16,293 vehicles per day (2019 count), of which roughly 4% are trucks.

How long is HWY South ST over Water Stony Brook?

The structure is 66 ft (20.1 m) long with a longest span of 63 ft (19.2 m) and a deck 42 ft wide.

Who owns HWY South ST over Water Stony Brook?

It is owned by the City or Municipal Highway Agency.