US Bridges

HWY Mountain DR over I 91

Fair

Hampshire County, Massachusetts · Mm 30.8 on I-91 · Structure no. H1102313CDOTNBI

Built
1962
63 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
255 ft
5 main spans
Daily traffic
1,164
2016 count
Owner
State
State Highway Agency

About this bridge

HWY Mountain DR over I 91 is a steel stringer/multi-beam or girder carrying HWY Mountain DR over I 91 in Hampshire County, Massachusetts. It was built in 1962, 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 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 1,164 vehicles a day, roughly 5% of them trucks, projected to reach 3,474 by 2031. The structure is 255 ft (77.6 m) long and 41 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesHWY Mountain DR
CrossesI 91
LocationMm 30.8 on I-91
RouteCity Street 0
CountyHampshire County
StateMassachusetts
Coordinates42.41116, -72.62595
Functional classRural Minor Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
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 rating56.3 US tons
Inventory rating33.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length255 ft (77.6 m)
Longest span64 ft (19.4 m)
Deck width41 ft (12.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,164 (2016)
Projected traffic3,474 by 2031
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 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$9.4 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Mountain DR over I 91 built?

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

What condition is HWY Mountain DR 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 July 2024.

How much traffic does HWY Mountain DR over I 91 carry?

About 1,164 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is HWY Mountain DR over I 91?

The structure is 255 ft (77.6 m) long with a longest span of 64 ft (19.4 m) and a deck 41 ft wide.

Who owns HWY Mountain DR over I 91?

It is owned by the State Highway Agency.