US Bridges

N Main ST over Sebasticook River

Fair

Somerset County, Maine · 0.2 MI Nly of JCT 152 · Structure no. 2503

Built
1931
94 years old, rebuilt 1985
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
4,286
2016 count
Owner
State
State Highway Agency

About this bridge

N Main ST over Sebasticook River is a steel stringer/multi-beam or girder carrying N Main ST over Sebasticook River in Somerset County, Maine. It was built in 1931 and reconstructed in 1985, so it is 94 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 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 4,286 vehicles a day, roughly 5% of them trucks, projected to reach 6,000 by 2036. The structure is 60 ft (18.4 m) long and 49 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesN Main ST
CrossesSebasticook River
Location0.2 MI Nly of JCT 152
RouteState Highway 11
CountySomerset County
StateMaine
Coordinates44.78675, -69.38081
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.2 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length60 ft (18.4 m)
Longest span56 ft (17.1 m)
Deck width49 ft (14.9 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,286 (2016)
Projected traffic6,000 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was N Main ST over Sebasticook River built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1985.

What condition is N Main ST over Sebasticook 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 N Main ST over Sebasticook River carry?

About 4,286 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is N Main ST over Sebasticook River?

The structure is 60 ft (18.4 m) long with a longest span of 56 ft (17.1 m) and a deck 49 ft wide.

Who owns N Main ST over Sebasticook River?

It is owned by the State Highway Agency.