US Bridges

I 91 SB over HWY Prospect Ave

Fair

Hampden County, Massachusetts · Mm 11.0 on I-91 SB · Structure no. W21038112DOTNBI

Built
1967
58 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
83 ft
1 main span
Daily traffic
36,989
2017 count
Owner
State
State Highway Agency

About this bridge

I 91 SB over HWY Prospect Ave is a steel stringer/multi-beam or girder carrying I 91 SB over HWY Prospect Ave in Hampden County, Massachusetts. It was built in 1967, so it is 58 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 36,989 vehicles a day, roughly 12% of them trucks, projected to reach 116,552 by 2031. The structure is 83 ft (25.4 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 91 SB
CrossesHWY Prospect Ave
LocationMm 11.0 on I-91 SB
RouteInterstate 91
CountyHampden County
StateMassachusetts
Coordinates42.15474, -72.64864
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating32.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length83 ft (25.4 m)
Longest span80 ft (24.4 m)
Deck width56 ft (17.1 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,989 (2017)
Projected traffic116,552 by 2031
Trucks12%
Lanes on structure3
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4.3 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 91 SB over HWY Prospect Ave built?

It was built in 1967, making it 58 years old in 2025.

What condition is I 91 SB over HWY Prospect Ave 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 2024.

How much traffic does I 91 SB over HWY Prospect Ave carry?

About 36,989 vehicles per day (2017 count), of which roughly 12% are trucks.

How long is I 91 SB over HWY Prospect Ave?

The structure is 83 ft (25.4 m) long with a longest span of 80 ft (24.4 m) and a deck 56 ft wide.

Who owns I 91 SB over HWY Prospect Ave?

It is owned by the State Highway Agency.