US Bridges

I 391 SB over I 91

Fair

Hampden County, Massachusetts · Mm 8.4 on I-91 · Structure no. C130360WHDOTNBI

Built
1967
58 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
226 ft
2 main spans
Daily traffic
37,759
2015 count
Owner
State
State Highway Agency

About this bridge

I 391 SB over I 91 is a steel continuous stringer/multi-beam or girder carrying I 391 SB over I 91 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 37,759 vehicles a day, roughly 10% of them trucks, projected to reach 65,279 by 2032. The structure is 226 ft (69 m) long and 56 ft wide.

Location

Open in Google Maps
CarriesI 391 SB
CrossesI 91
LocationMm 8.4 on I-91
RouteInterstate 391
CountyHampden County
StateMassachusetts
Coordinates42.1344, -72.60957
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.1 US tons
Inventory rating36.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length226 ft (69 m)
Longest span116 ft (35.4 m)
Deck width56 ft (17.1 m)
Roadway width52 ft (15.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,759 (2015)
Projected traffic65,279 by 2032
Trucks10%
Lanes on structure3
Traffic directionOne-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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$11.7 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 391 SB over I 91 built?

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

What condition is I 391 SB over I 91 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 October 2023.

How much traffic does I 391 SB over I 91 carry?

About 37,759 vehicles per day (2015 count), of which roughly 10% are trucks.

How long is I 391 SB over I 91?

The structure is 226 ft (69 m) long with a longest span of 116 ft (35.4 m) and a deck 56 ft wide.

Who owns I 391 SB over I 91?

It is owned by the State Highway Agency.