US Bridges

I 90 EB over US 20 N Beacon ST

Fair

Suffolk County, Massachusetts · .2 MI S. Charles Rv S39 · Structure no. B160604RJDOTNBI

Built
1964
61 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
124 ft
2 main spans
Daily traffic
52,193
2024 count
Owner
State
State Highway Agency

About this bridge

I 90 EB over US 20 N Beacon ST is a steel stringer/multi-beam or girder carrying I 90 EB over US 20 N Beacon ST in Suffolk County, Massachusetts. It was built in 1964, so it is 61 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 52,193 vehicles a day, roughly 4% of them trucks, projected to reach 164,868 by 2031. The structure is 124 ft (37.8 m) long and 57 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesI 90 EB
CrossesUS 20 N Beacon ST
Location.2 MI S. Charles Rv S39
RouteInterstate 90
CountySuffolk County
StateMassachusetts
Coordinates42.35773, -71.15407
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.9 US tons
Inventory rating47.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length124 ft (37.8 m)
Longest span60 ft (18.3 m)
Deck width57 ft (17.5 m)
Roadway width53 ft (16.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic52,193 (2024)
Projected traffic164,868 by 2031
Trucks4%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a toll 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$6.5 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 90 EB over US 20 N Beacon ST built?

It was built in 1964, making it 61 years old in 2025.

What condition is I 90 EB over US 20 N Beacon 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 January 2024.

How much traffic does I 90 EB over US 20 N Beacon ST carry?

About 52,193 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is I 90 EB over US 20 N Beacon ST?

The structure is 124 ft (37.8 m) long with a longest span of 60 ft (18.3 m) and a deck 57 ft wide.

Who owns I 90 EB over US 20 N Beacon ST?

It is owned by the State Highway Agency.