US Bridges

ST 1 A/High ST over US 1

FairPosted for load

Essex County, Massachusetts · .4 MI S Merrimac River · Structure no. N110142TUDOTNBI

Built
1934
91 years old
Condition
Fair
inspected July 2024
Type
Frame
Steel
Length
66 ft
1 main span
Daily traffic
14,930
2024 count
Owner
State
State Highway Agency

About this bridge

ST 1 A/High ST over US 1 is a steel frame carrying ST 1 A/High ST over US 1 in Essex County, Massachusetts. It was built in 1934, so it is 91 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. Its operating status is: posted for load restriction.

It carries about 14,930 vehicles a day, roughly 7% of them trucks, projected to reach 60,487 by 2031. The structure is 66 ft (20.1 m) long and 71 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesST 1 A/High ST
CrossesUS 1
Location.4 MI S Merrimac River
RouteState Highway 1A
CountyEssex County
StateMassachusetts
Coordinates42.80983, -70.87699
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
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 inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 alignment7: Better than present minimum criteria
Operating rating53.2 US tons
Inventory rating31.9 US tons

Structure

Structure typeFrame
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length66 ft (20.1 m)
Longest span57 ft (17.3 m)
Deck width71 ft (21.6 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,930 (2024)
Projected traffic60,487 by 2031
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4.4 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 1 A/High ST over US 1 built?

It was built in 1934, making it 91 years old in 2025.

What condition is ST 1 A/High ST over US 1 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 July 2024.

How much traffic does ST 1 A/High ST over US 1 carry?

About 14,930 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is ST 1 A/High ST over US 1?

The structure is 66 ft (20.1 m) long with a longest span of 57 ft (17.3 m) and a deck 71 ft wide.

Who owns ST 1 A/High ST over US 1?

It is owned by the State Highway Agency.