US Bridges

Mill ST over Sebasticook River

Fair

Somerset County, Maine · .2 MI N JCT #43 · Structure no. 1096

Built
1979
46 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
126 ft
2 main spans
Daily traffic
357
2016 count
Owner
State
State Highway Agency

About this bridge

Mill ST over Sebasticook River is a steel continuous stringer/multi-beam or girder carrying Mill ST over Sebasticook River in Somerset County, Maine. It was built in 1979, so it is 46 years old, younger 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 357 vehicles a day, roughly 5% of them trucks, projected to reach 571 by 2036. The structure is 126 ft (38.3 m) long and 36 ft wide.

Location

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CarriesMill ST
CrossesSebasticook River
Location.2 MI N JCT #43
RouteCity Street 0
CountySomerset County
StateMaine
Coordinates44.88498, -69.45262
Functional classRural Local

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.
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 geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37.1 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length126 ft (38.3 m)
Longest span60 ft (18.3 m)
Deck width36 ft (11.1 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic357 (2016)
Projected traffic571 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mill ST over Sebasticook River built?

It was built in 1979, making it 46 years old in 2025.

What condition is Mill 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 Mill ST over Sebasticook River carry?

About 357 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Mill ST over Sebasticook River?

The structure is 126 ft (38.3 m) long with a longest span of 60 ft (18.3 m) and a deck 36 ft wide.

Who owns Mill ST over Sebasticook River?

It is owned by the State Highway Agency.