US Bridges

ST 1 A/Cabot ST over Water Danvers River

Fair

Essex County, Massachusetts · At Danvers River · Structure no. B110042TNDOTNBI

Built
1996
29 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
2,233 ft
14 main spans
Daily traffic
48,600
2023 count
Owner
State
State Highway Agency

About this bridge

ST 1 A/Cabot ST over Water Danvers River is a steel continuous stringer/multi-beam or girder carrying ST 1 A/Cabot ST over Water Danvers River in Essex County, Massachusetts. It was built in 1996, so it is 29 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 48,600 vehicles a day, roughly 4% of them trucks, projected to reach 50,538 by 2032. The structure is 2,233 ft (680.6 m) long and 89 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesST 1 A/Cabot ST
CrossesWater Danvers River
LocationAt Danvers River
RouteState Highway 1A
CountyEssex County
StateMassachusetts
Coordinates42.53912, -70.88761
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating68.1 US tons
Inventory rating40.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans14
Design loadHS 20
Structure length2,233 ft (680.6 m)
Longest span220 ft (67.1 m)
Deck width89 ft (27 m)
Roadway width79 ft (24.1 m)
Vertical clearance over deck18 ft (5.6 m)

Traffic and service

Average daily traffic48,600 (2023)
Projected traffic50,538 by 2032
Trucks4%
Lanes on structure4
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$35.8 million (2025 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was ST 1 A/Cabot ST over Water Danvers River built?

It was built in 1996, making it 29 years old in 2025.

What condition is ST 1 A/Cabot ST over Water Danvers 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 December 2023.

How much traffic does ST 1 A/Cabot ST over Water Danvers River carry?

About 48,600 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is ST 1 A/Cabot ST over Water Danvers River?

The structure is 2,233 ft (680.6 m) long with a longest span of 220 ft (67.1 m) and a deck 89 ft wide.

Who owns ST 1 A/Cabot ST over Water Danvers River?

It is owned by the State Highway Agency.