US Bridges

I 91 SB over Water Green River

Fair

Franklin County, Massachusetts · Mm 44.2 on I-91 SB · Structure no. G120490XNDOTNBI

Built
1962
63 years old, rebuilt 1986
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
185 ft
3 main spans
Daily traffic
18,071
2017 count
Owner
State
State Highway Agency

About this bridge

I 91 SB over Water Green River is a steel stringer/multi-beam or girder carrying I 91 SB over Water Green River in Franklin County, Massachusetts. It was built in 1962 and reconstructed in 1986, so it is 63 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 5 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 18,071 vehicles a day, roughly 12% of them trucks, projected to reach 34,745 by 2031. The structure is 185 ft (56.5 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 91 SB
CrossesWater Green River
LocationMm 44.2 on I-91 SB
RouteInterstate 91
CountyFranklin County
StateMassachusetts
Coordinates42.60281, -72.61517
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.9 US tons
Inventory rating50.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length185 ft (56.5 m)
Longest span83 ft (25.3 m)
Deck width45 ft (13.6 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,071 (2017)
Projected traffic34,745 by 2031
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$7.6 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I 91 SB over Water Green River built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1986.

What condition is I 91 SB over Water Green River 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 May 2024.

How much traffic does I 91 SB over Water Green River carry?

About 18,071 vehicles per day (2017 count), of which roughly 12% are trucks.

How long is I 91 SB over Water Green River?

The structure is 185 ft (56.5 m) long with a longest span of 83 ft (25.3 m) and a deck 45 ft wide.

Who owns I 91 SB over Water Green River?

It is owned by the State Highway Agency.