US Bridges

I 91 SB over HWY Island RD

Fair

Hampshire County, Massachusetts · Mm 21.7 on I-91 SB · Structure no. N190560YXDOTNBI

Built
1965
60 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
61 ft
1 main span
Daily traffic
27,446
2018 count
Owner
State
State Highway Agency

About this bridge

I 91 SB over HWY Island RD is a steel stringer/multi-beam or girder carrying I 91 SB over HWY Island RD in Hampshire County, Massachusetts. It was built in 1965, so it is 60 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 27,446 vehicles a day, roughly 10% of them trucks, projected to reach 37,035 by 2032. The structure is 61 ft (18.6 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 91 SB
CrossesHWY Island RD
LocationMm 21.7 on I-91 SB
RouteInterstate 91
CountyHampshire County
StateMassachusetts
Coordinates42.29187, -72.6281
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.9 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length61 ft (18.6 m)
Longest span57 ft (17.4 m)
Deck width44 ft (13.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,446 (2018)
Projected traffic37,035 by 2032
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$2.5 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 91 SB over HWY Island RD built?

It was built in 1965, making it 60 years old in 2025.

What condition is I 91 SB over HWY Island RD 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 September 2023.

How much traffic does I 91 SB over HWY Island RD carry?

About 27,446 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is I 91 SB over HWY Island RD?

The structure is 61 ft (18.6 m) long with a longest span of 57 ft (17.4 m) and a deck 44 ft wide.

Who owns I 91 SB over HWY Island RD?

It is owned by the State Highway Agency.