US Bridges

Little Deer Isle R over Eggemoggin Reach

FairPosted for load

Hancock County, Maine · 1 MI S 15&175 · Structure no. 3257

Built
1939
86 years old
Condition
Fair
inspected April 2023
Type
Suspension
Steel Continuous
Length
2,505 ft
3 main spans
Daily traffic
4,800
2023 count
Owner
State
State Highway Agency

About this bridge

Little Deer Isle R over Eggemoggin Reach is a steel continuous suspension carrying Little Deer Isle R over Eggemoggin Reach in Hancock County, Maine. It was built in 1939, so it is 86 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. Its operating status is: posted for other load-capacity restriction.

It carries about 4,800 vehicles a day, roughly 12% of them trucks, projected to reach 4,239 by 2036. The structure is 2,505 ft (763.5 m) long and 25 ft wide. If it were closed, the detour would be 100 mi (161 km).

Location

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CarriesLittle Deer Isle R
CrossesEggemoggin Reach
Location1 MI S 15&175
RouteState Highway 15
CountyHancock County
StateMaine
Coordinates44.29392, -68.68893
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment6: Equal to present minimum criteria
Operating rating25.4 US tons
Inventory rating14.6 US tons

Structure

Structure typeSuspension
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+7 approach)
Design loadH 15
Structure length2,505 ft (763.5 m)
Longest span1,080 ft (329.2 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deck14 ft (4.3 m)

Traffic and service

Average daily traffic4,800 (2023)
Projected traffic4,239 by 2036
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Little Deer Isle R over Eggemoggin Reach built?

It was built in 1939, making it 86 years old in 2025.

What condition is Little Deer Isle R over Eggemoggin Reach 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 April 2023.

How much traffic does Little Deer Isle R over Eggemoggin Reach carry?

About 4,800 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is Little Deer Isle R over Eggemoggin Reach?

The structure is 2,505 ft (763.5 m) long with a longest span of 1,080 ft (329.2 m) and a deck 25 ft wide.

Who owns Little Deer Isle R over Eggemoggin Reach?

It is owned by the State Highway Agency.