US Bridges

Main ST over Sebasticook River

Fair

Somerset County, Maine · 450 E of JCT RTE 152 · Structure no. 3390

Built
1930
95 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
34 ft
1 main span
Daily traffic
3,860
2016 count
Owner
State
State Highway Agency

About this bridge

Main ST over Sebasticook River is a steel stringer/multi-beam or girder carrying Main ST over Sebasticook River in Somerset County, Maine. It was built in 1930, so it is 95 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 3,860 vehicles a day, roughly 5% of them trucks, projected to reach 5,404 by 2036. The structure is 34 ft (10.5 m) long and 40 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

Location

Open in Google Maps
CarriesMain ST
CrossesSebasticook River
Location450 E of JCT RTE 152
RouteCounty Highway 23
CountySomerset County
StateMaine
Coordinates44.88302, -69.4485
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
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.9 US tons
Inventory rating32.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length34 ft (10.5 m)
Longest span31 ft (9.3 m)
Deck width40 ft (12.2 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,860 (2016)
Projected traffic5,404 by 2036
Trucks5%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed26.7 mi (43 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 Main ST over Sebasticook River built?

It was built in 1930, making it 95 years old in 2025.

What condition is 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 July 2023.

How much traffic does Main ST over Sebasticook River carry?

About 3,860 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Main ST over Sebasticook River?

The structure is 34 ft (10.5 m) long with a longest span of 31 ft (9.3 m) and a deck 40 ft wide.

Who owns Main ST over Sebasticook River?

It is owned by the State Highway Agency.