US Bridges

Main ST over ST Croix River

Fair

Washington County, Maine · 0.3 MI N of JCT RTE US1 · Structure no. 2279

Built
1957
68 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
382 ft
3 main spans
Daily traffic
2,560
2016 count
Owner
State
State Highway Agency

About this bridge

Main ST over ST Croix River is a steel continuous stringer/multi-beam or girder carrying Main ST over ST Croix River in Washington County, Maine. It was built in 1957, so it is 68 years old, older than the Maine average of 53.7 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 2,560 vehicles a day, roughly 5% of them trucks, projected to reach 3,584 by 2036. The structure is 382 ft (116.5 m) long and 42 ft wide. If it were closed, the detour would be 100 mi (161 km).

Location

Open in Google Maps
CarriesMain ST
CrossesST Croix River
Location0.3 MI N of JCT RTE US1
RouteState Highway 9
CountyWashington County
StateMaine
Coordinates45.19152, -67.28351
Functional classRural 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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.2 US tons
Inventory rating30.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+1 approach)
Design loadHS 20
Structure length382 ft (116.5 m)
Longest span135 ft (41.1 m)
Deck width42 ft (12.7 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,560 (2016)
Projected traffic3,584 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed100 mi (161 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Main ST over ST Croix River built?

It was built in 1957, making it 68 years old in 2025.

What condition is Main ST over ST Croix 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 August 2024.

How much traffic does Main ST over ST Croix River carry?

About 2,560 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Main ST over ST Croix River?

The structure is 382 ft (116.5 m) long with a longest span of 135 ft (41.1 m) and a deck 42 ft wide.

Who owns Main ST over ST Croix River?

It is owned by the State Highway Agency.