US Bridges

I 95 /ST128 over Water Stony Brook

Fair

Middlesex County, Massachusetts · 0.96 KM Sly Rt 20 · Structure no. W040292F1DOTNBI

Built
1950
75 years old, rebuilt 1960
Condition
Fair
inspected December 2023
Type
Culvert
Concrete
Length
29 ft
2 main spans
Daily traffic
172,999
2018 count
Owner
State
State Highway Agency

About this bridge

I 95 /ST128 over Water Stony Brook is a concrete culvert carrying I 95 /ST128 over Water Stony Brook in Middlesex County, Massachusetts. It was built in 1950 and reconstructed in 1960, so it is 75 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 172,999 vehicles a day, roughly 10% of them trucks, projected to reach 272,003 by 2032. The structure is 29 ft (8.8 m) long and 142 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI 95 /ST128
CrossesWater Stony Brook
Location0.96 KM Sly Rt 20
RouteInterstate 128
CountyMiddlesex County
StateMassachusetts
Coordinates42.36299, -71.27049
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length29 ft (8.8 m)
Longest span12 ft (3.7 m)
Deck width142 ft (43.3 m)
Roadway width120 ft (36.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic172,999 (2018)
Projected traffic272,003 by 2032
Trucks10%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 statusPossibly eligible for the National Register; requires further investigation
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$208,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I 95 /ST128 over Water Stony Brook built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1960.

What condition is I 95 /ST128 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 December 2023.

How much traffic does I 95 /ST128 over Water Stony Brook carry?

About 172,999 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is I 95 /ST128 over Water Stony Brook?

The structure is 29 ft (8.8 m) long with a longest span of 12 ft (3.7 m) and a deck 142 ft wide.

Who owns I 95 /ST128 over Water Stony Brook?

It is owned by the State Highway Agency.