US Bridges

I 84 WB over ST 15 Mashapaug RD

Fair

Worcester County, Massachusetts · 4 MI South of US-20 · Structure no. S300361PHDOTNBI

Built
1970
55 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
169 ft
1 main span
Daily traffic
30,938
2023 count
Owner
State
State Highway Agency

About this bridge

I 84 WB over ST 15 Mashapaug RD is a steel stringer/multi-beam or girder carrying I 84 WB over ST 15 Mashapaug RD in Worcester County, Massachusetts. It was built in 1970, so it is 55 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 30,938 vehicles a day, roughly 21% of them trucks, projected to reach 44,220 by 2032. The structure is 169 ft (51.5 m) long and 60 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI 84 WB
CrossesST 15 Mashapaug RD
Location4 MI South of US-20
RouteInterstate 84
CountyWorcester County
StateMassachusetts
Coordinates42.06682, -72.10914
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionSeptember 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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.4 US tons
Inventory rating26.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length169 ft (51.5 m)
Longest span159 ft (48.5 m)
Deck width60 ft (18.3 m)
Roadway width55 ft (16.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,938 (2023)
Projected traffic44,220 by 2032
Trucks21%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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$9.3 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 84 WB over ST 15 Mashapaug RD built?

It was built in 1970, making it 55 years old in 2025.

What condition is I 84 WB over ST 15 Mashapaug RD 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 September 2023.

How much traffic does I 84 WB over ST 15 Mashapaug RD carry?

About 30,938 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is I 84 WB over ST 15 Mashapaug RD?

The structure is 169 ft (51.5 m) long with a longest span of 159 ft (48.5 m) and a deck 60 ft wide.

Who owns I 84 WB over ST 15 Mashapaug RD?

It is owned by the State Highway Agency.