US Bridges

ST 83 NB Ramp Z over I 91 & ST83 SB

Fair

Hampden County, Massachusetts · At JCT I-91 · Structure no. S24050120DOTNBI

Built
1958
67 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
414 ft
6 main spans
Daily traffic
5,100
2017 count
Owner
State
State Highway Agency

About this bridge

ST 83 NB Ramp Z over I 91 & ST83 SB is a steel stringer/multi-beam or girder carrying ST 83 NB Ramp Z over I 91 & ST83 SB in Hampden County, Massachusetts. It was built in 1958, so it is 67 years old, older 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 5,100 vehicles a day, roughly 5% of them trucks, projected to reach 6,633 by 2032. The structure is 414 ft (126.2 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesST 83 NB Ramp Z
CrossesI 91 & ST83 SB
LocationAt JCT I-91
RouteState Highway 21
CountyHampden County
StateMassachusetts
Coordinates42.07781, -72.58
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating17.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length414 ft (126.2 m)
Longest span80 ft (24.4 m)
Deck width30 ft (9.2 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,100 (2017)
Projected traffic6,633 by 2032
Trucks5%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

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$11.4 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 83 NB Ramp Z over I 91 & ST83 SB built?

It was built in 1958, making it 67 years old in 2025.

What condition is ST 83 NB Ramp Z over I 91 & ST83 SB 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 March 2023.

How much traffic does ST 83 NB Ramp Z over I 91 & ST83 SB carry?

About 5,100 vehicles per day (2017 count), of which roughly 5% are trucks.

How long is ST 83 NB Ramp Z over I 91 & ST83 SB?

The structure is 414 ft (126.2 m) long with a longest span of 80 ft (24.4 m) and a deck 30 ft wide.

Who owns ST 83 NB Ramp Z over I 91 & ST83 SB?

It is owned by the State Highway Agency.