US Bridges

I 91 over HWY Main ST (s End)

Fair

Hampden County, Massachusetts · Mm 4.5 on I-91 · Structure no. S2405410FDOTNBI

Built
1963
62 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
171 ft
4 main spans
Daily traffic
210,733
2016 count
Owner
State
State Highway Agency

About this bridge

I 91 over HWY Main ST (s End) is a steel stringer/multi-beam or girder carrying I 91 over HWY Main ST (s End) in Hampden County, Massachusetts. It was built in 1963, so it is 62 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 210,733 vehicles a day, roughly 6% of them trucks, projected to reach 144,032 by 2031. The structure is 171 ft (52.1 m) long and 112 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 91
CrossesHWY Main ST (s End)
LocationMm 4.5 on I-91
RouteInterstate 91
CountyHampden County
StateMassachusetts
Coordinates42.08758, -72.58083
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 inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment7: Better than present minimum criteria
Operating rating56.8 US tons
Inventory rating33.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length171 ft (52.1 m)
Longest span66 ft (20.2 m)
Deck width112 ft (34.2 m)
Roadway width88 ft (26.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic210,733 (2016)
Projected traffic144,032 by 2031
Trucks6%
Lanes on structure7
Traffic directionTwo-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$17.7 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 91 over HWY Main ST (s End) built?

It was built in 1963, making it 62 years old in 2025.

What condition is I 91 over HWY Main ST (s End) 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 over HWY Main ST (s End) carry?

About 210,733 vehicles per day (2016 count), of which roughly 6% are trucks.

How long is I 91 over HWY Main ST (s End)?

The structure is 171 ft (52.1 m) long with a longest span of 66 ft (20.2 m) and a deck 112 ft wide.

Who owns I 91 over HWY Main ST (s End)?

It is owned by the State Highway Agency.