US Bridges

Main ST over Mill Stream

Poor

Hancock County, Maine · 0.1 MI W of JCT RTE US 1 · Structure no. 2496

Built
1923
102 years old
Condition
Poor
inspected October 2024
Type
Tee Beam
Concrete
Length
44 ft
1 main span
Daily traffic
9,693
2016 count
Owner
State
State Highway Agency

About this bridge

Main ST over Mill Stream is a concrete tee beam carrying Main ST over Mill Stream in Hancock County, Maine. It was built in 1923, so it is 102 years old, older than the Maine average of 53.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 9,693 vehicles a day, roughly 5% of them trucks, projected to reach 13,570 by 2036. The structure is 44 ft (13.4 m) long and 45 ft wide. If it were closed, the detour would be 62.1 mi (100 km).

Location

Open in Google Maps
CarriesMain ST
CrossesMill Stream
Location0.1 MI W of JCT RTE US 1
RouteState Highway 15
CountyHancock County
StateMaine
Coordinates44.57124, -68.78884
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, 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 inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.1 US tons
Inventory rating35.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length44 ft (13.4 m)
Longest span40 ft (12.2 m)
Deck width45 ft (13.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,693 (2016)
Projected traffic13,570 by 2036
Trucks5%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed62.1 mi (100 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 Mill Stream built?

It was built in 1923, making it 102 years old in 2025.

What condition is Main ST over Mill Stream in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does Main ST over Mill Stream carry?

About 9,693 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Main ST over Mill Stream?

The structure is 44 ft (13.4 m) long with a longest span of 40 ft (12.2 m) and a deck 45 ft wide.

Who owns Main ST over Mill Stream?

It is owned by the State Highway Agency.