US Bridges

ST 79 over RR Macrr

Fair

Bristol County, Massachusetts · MP Qnf 9.34 · Structure no. F020543V9DOTNBI

Built
1974
51 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
54 ft
1 main span
Daily traffic
36,983
2024 count
Owner
State
State Highway Agency

About this bridge

ST 79 over RR Macrr is a prestressed concrete stringer/multi-beam or girder carrying ST 79 over RR Macrr in Bristol County, Massachusetts. It was built in 1974, so it is 51 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 36,983 vehicles a day, roughly 9% of them trucks, projected to reach 63,330 by 2033. The structure is 54 ft (16.5 m) long and 96 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesST 79
CrossesRR Macrr
LocationMP Qnf 9.34
RouteState Highway 79
CountyBristol County
StateMassachusetts
Coordinates41.72905, -71.13895
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.8 US tons
Inventory rating36.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length54 ft (16.5 m)
Longest span51 ft (15.5 m)
Deck width96 ft (29.4 m)
Roadway width79 ft (24 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,983 (2024)
Projected traffic63,330 by 2033
Trucks9%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$2.2 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 79 over RR Macrr built?

It was built in 1974, making it 51 years old in 2025.

What condition is ST 79 over RR Macrr 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 79 over RR Macrr carry?

About 36,983 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is ST 79 over RR Macrr?

The structure is 54 ft (16.5 m) long with a longest span of 51 ft (15.5 m) and a deck 96 ft wide.

Who owns ST 79 over RR Macrr?

It is owned by the State Highway Agency.