US Bridges

ST 30 Comm Ave over Comb I 90 & Csx/Mbta

Fair

Middlesex County, Massachusetts · .64 KM W. Int 16 S14 · Structure no. N120294QRDOTNBI

Built
1964
61 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
187 ft
3 main spans
Daily traffic
10,862
2024 count
Owner
State
State Highway Agency

About this bridge

ST 30 Comm Ave over Comb I 90 & Csx/Mbta is a steel stringer/multi-beam or girder carrying ST 30 Comm Ave over Comb I 90 & Csx/Mbta in Middlesex 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 10,862 vehicles a day, roughly 4% of them trucks, projected to reach 21,478 by 2031. The structure is 187 ft (57 m) long and 53 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesST 30 Comm Ave
CrossesComb I 90 & Csx/Mbta
Location.64 KM W. Int 16 S14
RouteInterstate 90
CountyMiddlesex County
StateMassachusetts
Coordinates42.34669, -71.24218
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
Deck7 GoodSome minor problems.
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 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93.6 US tons
Inventory rating56 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length187 ft (57 m)
Longest span67 ft (20.3 m)
Deck width53 ft (16.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,862 (2024)
Projected traffic21,478 by 2031
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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$9.2 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 30 Comm Ave over Comb I 90 & Csx/Mbta built?

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

What condition is ST 30 Comm Ave over Comb I 90 & Csx/Mbta 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 ST 30 Comm Ave over Comb I 90 & Csx/Mbta carry?

About 10,862 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is ST 30 Comm Ave over Comb I 90 & Csx/Mbta?

The structure is 187 ft (57 m) long with a longest span of 67 ft (20.3 m) and a deck 53 ft wide.

Who owns ST 30 Comm Ave over Comb I 90 & Csx/Mbta?

It is owned by the State Highway Agency.