US Bridges

ST129 Salem ST over US 1 Newburyport Tnpk

Fair

Essex County, Massachusetts · .32 KM S ST128 · Structure no. L1901431BDOTNBI

Built
1959
66 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
73 ft
1 main span
Daily traffic
40,800
2024 count
Owner
State
State Highway Agency

About this bridge

ST129 Salem ST over US 1 Newburyport Tnpk is a steel stringer/multi-beam or girder carrying ST129 Salem ST over US 1 Newburyport Tnpk in Essex County, Massachusetts. It was built in 1959, so it is 66 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 40,800 vehicles a day, roughly 7% of them trucks, projected to reach 117,816 by 2031. The structure is 73 ft (22.3 m) long and 160 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesST129 Salem ST
CrossesUS 1 Newburyport Tnpk
Location.32 KM S ST128
RouteState Highway 129
CountyEssex County
StateMassachusetts
Coordinates42.51429, -71.00351
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.8 US tons
Inventory rating39.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length73 ft (22.3 m)
Longest span68 ft (20.7 m)
Deck width160 ft (48.7 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40,800 (2024)
Projected traffic117,816 by 2031
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 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$10.9 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST129 Salem ST over US 1 Newburyport Tnpk built?

It was built in 1959, making it 66 years old in 2025.

What condition is ST129 Salem ST over US 1 Newburyport Tnpk 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 November 2024.

How much traffic does ST129 Salem ST over US 1 Newburyport Tnpk carry?

About 40,800 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is ST129 Salem ST over US 1 Newburyport Tnpk?

The structure is 73 ft (22.3 m) long with a longest span of 68 ft (20.7 m) and a deck 160 ft wide.

Who owns ST129 Salem ST over US 1 Newburyport Tnpk?

It is owned by the State Highway Agency.