US Bridges

HWY Atherton ST over Comb Amtrak/Mbta & Orng

Fair

Suffolk County, Massachusetts · N of Stony Brook Substa · Structure no. B160964VDMBTNBI

Built
1980
45 years old
Condition
Fair
inspected September 2022
Type
Frame
Concrete Continuous
Length
91 ft
2 main spans
Daily traffic
3,500
1997 count
Owner
State
Other State Agency

About this bridge

HWY Atherton ST over Comb Amtrak/Mbta & Orng is a concrete continuous frame carrying HWY Atherton ST over Comb Amtrak/Mbta & Orng in Suffolk County, Massachusetts. It was built in 1980, so it is 45 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 6 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 3,500 vehicles a day, roughly 5% of them trucks, projected to reach 1,106 by 2032. The structure is 91 ft (27.7 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesHWY Atherton ST
CrossesComb Amtrak/Mbta & Orng
LocationN of Stony Brook Substa
RouteCity Street 0
CountySuffolk County
StateMassachusetts
Coordinates42.31928, -71.10287
Functional classUrban Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating81.5 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length91 ft (27.7 m)
Longest span46 ft (14.1 m)
Deck width40 ft (12.2 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,500 (1997)
Projected traffic1,106 by 2032
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther State Agency
Maintained byOther State Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$3.6 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Atherton ST over Comb Amtrak/Mbta & Orng built?

It was built in 1980, making it 45 years old in 2025.

What condition is HWY Atherton ST over Comb Amtrak/Mbta & Orng 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 2022.

How much traffic does HWY Atherton ST over Comb Amtrak/Mbta & Orng carry?

About 3,500 vehicles per day (1997 count), of which roughly 5% are trucks.

How long is HWY Atherton ST over Comb Amtrak/Mbta & Orng?

The structure is 91 ft (27.7 m) long with a longest span of 46 ft (14.1 m) and a deck 40 ft wide.

Who owns HWY Atherton ST over Comb Amtrak/Mbta & Orng?

It is owned by the Other State Agency.