US Bridges

ST128 over Water Annisquam River

Fair

Essex County, Massachusetts · At Annisquam River · Structure no. G050172U8DOTNBI

Built
1950
75 years old, rebuilt 2013
Condition
Fair
inspected July 2023
Type
Arch - Deck
Steel
Length
862 ft
1 main span
Daily traffic
42,201
2023 count
Owner
State
State Highway Agency

About this bridge

ST128 over Water Annisquam River is a steel arch - deck carrying ST128 over Water Annisquam River in Essex County, Massachusetts. It was built in 1950 and reconstructed in 2013, so it is 75 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 42,201 vehicles a day, roughly 10% of them trucks, projected to reach 55,433 by 2032. The structure is 862 ft (262.7 m) long and 68 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesST128
CrossesWater Annisquam River
LocationAt Annisquam River
RouteState Highway 128
Coordinates42.62535, -70.68894
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
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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating43.4 US tons
Inventory rating26 US tons

Structure

Structure typeArch - Deck
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+6 approach)
Design loadH 20
Structure length862 ft (262.7 m)
Longest span420 ft (128 m)
Deck width68 ft (20.7 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42,201 (2023)
Projected traffic55,433 by 2032
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 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$53 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST128 over Water Annisquam River built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 2013.

What condition is ST128 over Water Annisquam 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 July 2023.

How much traffic does ST128 over Water Annisquam River carry?

About 42,201 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is ST128 over Water Annisquam River?

The structure is 862 ft (262.7 m) long with a longest span of 420 ft (128 m) and a deck 68 ft wide.

Who owns ST128 over Water Annisquam River?

It is owned by the State Highway Agency.