US Bridges

ST 28 Sb/N Main ST over I 495 Ramp D

Fair

Essex County, Massachusetts · 1.8 MI N Andover Center · Structure no. A090422YRDOTNBI

Built
1962
63 years old, rebuilt 1988
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
111 ft
3 main spans
Daily traffic
16,293
2024 count
Owner
State
State Highway Agency

About this bridge

ST 28 Sb/N Main ST over I 495 Ramp D is a steel stringer/multi-beam or girder carrying ST 28 Sb/N Main ST over I 495 Ramp D in Essex County, Massachusetts. It was built in 1962 and reconstructed in 1988, 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 16,293 vehicles a day, roughly 4% of them trucks, projected to reach 15,161 by 2033. The structure is 111 ft (33.8 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesST 28 Sb/N Main ST
CrossesI 495 Ramp D
Location1.8 MI N Andover Center
RouteState Highway 28
CountyEssex County
StateMassachusetts
Coordinates42.68036, -71.15311
Functional classUrban Other Principal Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.1 US tons
Inventory rating52.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length111 ft (33.8 m)
Longest span41 ft (12.5 m)
Deck width45 ft (13.7 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,293 (2024)
Projected traffic15,161 by 2033
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4.5 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 28 Sb/N Main ST over I 495 Ramp D built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1988.

What condition is ST 28 Sb/N Main ST over I 495 Ramp D 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 February 2024.

How much traffic does ST 28 Sb/N Main ST over I 495 Ramp D carry?

About 16,293 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is ST 28 Sb/N Main ST over I 495 Ramp D?

The structure is 111 ft (33.8 m) long with a longest span of 41 ft (12.5 m) and a deck 45 ft wide.

Who owns ST 28 Sb/N Main ST over I 495 Ramp D?

It is owned by the State Highway Agency.