US Bridges

ST 79 S Main ST over Water Assonet River

Fair

Bristol County, Massachusetts · .9 MI NE of RTE 24 · Structure no. F090023KPMUNNBI

Built
1886
139 years old
Condition
Fair
inspected October 2024
Type
Arch - Deck
Masonry
Length
38 ft
1 main span
Daily traffic
14,353
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

ST 79 S Main ST over Water Assonet River is a masonry arch - deck carrying ST 79 S Main ST over Water Assonet River in Bristol County, Massachusetts. It was built in 1886, so it is 139 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 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 14,353 vehicles a day, roughly 13% of them trucks, projected to reach 23,690 by 2031. The structure is 38 ft (11.6 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesST 79 S Main ST
CrossesWater Assonet River
Location.9 MI NE of RTE 24
RouteCity Street 79
CountyBristol County
StateMassachusetts
Coordinates41.79389, -71.06758
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
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating56.1 US tons
Inventory rating56 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans1
Design loadH 20
Structure length38 ft (11.6 m)
Longest span38 ft (11.6 m)
Deck width33 ft (10 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,353 (2024)
Projected traffic23,690 by 2031
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.7 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST 79 S Main ST over Water Assonet River built?

It was built in 1886, making it 139 years old in 2025.

What condition is ST 79 S Main ST over Water Assonet 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 October 2024.

How much traffic does ST 79 S Main ST over Water Assonet River carry?

About 14,353 vehicles per day (2024 count), of which roughly 13% are trucks.

How long is ST 79 S Main ST over Water Assonet River?

The structure is 38 ft (11.6 m) long with a longest span of 38 ft (11.6 m) and a deck 33 ft wide.

Who owns ST 79 S Main ST over Water Assonet River?

It is owned by the Town or Township Highway Agency.