US Bridges

I 91 over HWY Union ST

Fair

Hampden County, Massachusetts · JCT Union St. · Structure no. S2405710HDOTNBI

Built
1962
63 years old, rebuilt 2018
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
158 ft
3 main spans
Daily traffic
114,200
2018 count
Owner
State
State Highway Agency

About this bridge

I 91 over HWY Union ST is a steel stringer/multi-beam or girder carrying I 91 over HWY Union ST in Hampden County, Massachusetts. It was built in 1962 and reconstructed in 2018, 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 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 114,200 vehicles a day, roughly 6% of them trucks, projected to reach 180,356 by 2033. The structure is 158 ft (48.1 m) long and 122 ft wide.

Location

Open in Google Maps
CarriesI 91
CrossesHWY Union ST
LocationJCT Union St.
RouteInterstate 91
CountyHampden County
StateMassachusetts
Coordinates42.09681, -72.58708
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.1 US tons
Inventory rating35.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length158 ft (48.1 m)
Longest span69 ft (21 m)
Deck width122 ft (37.2 m)
Roadway width107 ft (32.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic114,200 (2018)
Projected traffic180,356 by 2033
Trucks6%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 91 over HWY Union ST built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2018.

What condition is I 91 over HWY Union ST 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 April 2024.

How much traffic does I 91 over HWY Union ST carry?

About 114,200 vehicles per day (2018 count), of which roughly 6% are trucks.

How long is I 91 over HWY Union ST?

The structure is 158 ft (48.1 m) long with a longest span of 69 ft (21 m) and a deck 122 ft wide.

Who owns I 91 over HWY Union ST?

It is owned by the State Highway Agency.