US Bridges

HWY Fairmount Av over Water Neponset River

Fair

Suffolk County, Massachusetts · Just NW of Truman HWY · Structure no. B16025386MUNNBI

Built
1907
118 years old, rebuilt 1973
Condition
Fair
inspected May 2023
Type
Arch - Deck
Concrete
Length
71 ft
1 main span
Daily traffic
16,600
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

HWY Fairmount Av over Water Neponset River is a concrete arch - deck carrying HWY Fairmount Av over Water Neponset River in Suffolk County, Massachusetts. It was built in 1907 and reconstructed in 1973, so it is 118 years old, older 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 16,600 vehicles a day, roughly 3% of them trucks, projected to reach 29,849 by 2032. The structure is 71 ft (21.6 m) long and 50 ft wide.

Location

Open in Google Maps
CarriesHWY Fairmount Av
CrossesWater Neponset River
LocationJust NW of Truman HWY
RouteCity Street 0
CountySuffolk County
StateMassachusetts
Coordinates42.25314, -71.11892
Functional classUrban Minor 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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length71 ft (21.6 m)
Longest span71 ft (21.6 m)
Deck width50 ft (15.2 m)
Roadway width35 ft (10.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,600 (2023)
Projected traffic29,849 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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$3.3 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY Fairmount Av over Water Neponset River built?

It was built in 1907, making it 118 years old in 2025. It was reconstructed in 1973.

What condition is HWY Fairmount Av over Water Neponset River 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 May 2023.

How much traffic does HWY Fairmount Av over Water Neponset River carry?

About 16,600 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is HWY Fairmount Av over Water Neponset River?

The structure is 71 ft (21.6 m) long with a longest span of 71 ft (21.6 m) and a deck 50 ft wide.

Who owns HWY Fairmount Av over Water Neponset River?

It is owned by the City or Municipal Highway Agency.