US Bridges

HWY Porter ST over Other Pedestrian Wlkwy

Fair

Suffolk County, Massachusetts · 15.2 M S of SR 1A · Structure no. B160733HTDOT634

Built
1907
118 years old, rebuilt 1979
Condition
Fair
inspected February 2024
Type
Slab
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
4,300
2024 count
Owner
State
State Highway Agency

About this bridge

HWY Porter ST over Other Pedestrian Wlkwy is a prestressed concrete slab carrying HWY Porter ST over Other Pedestrian Wlkwy in Suffolk County, Massachusetts. It was built in 1907 and reconstructed in 1979, 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 4,300 vehicles a day, roughly 6% of them trucks, projected to reach 11,371 by 2033. The structure is 40 ft (12.2 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesHWY Porter ST
CrossesOther Pedestrian Wlkwy
Location15.2 M S of SR 1A
RouteCity Street 0
CountySuffolk County
StateMassachusetts
Coordinates42.37206, -71.03409
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating72.3 US tons
Inventory rating37.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span38 ft (11.6 m)
Deck width49 ft (14.8 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,300 (2024)
Projected traffic11,371 by 2033
Trucks6%
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

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$1.9 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Porter ST over Other Pedestrian Wlkwy built?

It was built in 1907, making it 118 years old in 2025. It was reconstructed in 1979.

What condition is HWY Porter ST over Other Pedestrian Wlkwy 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 February 2024.

How much traffic does HWY Porter ST over Other Pedestrian Wlkwy carry?

About 4,300 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is HWY Porter ST over Other Pedestrian Wlkwy?

The structure is 40 ft (12.2 m) long with a longest span of 38 ft (11.6 m) and a deck 49 ft wide.

Who owns HWY Porter ST over Other Pedestrian Wlkwy?

It is owned by the State Highway Agency.