US Bridges

Main ST over Sebec River

Poor

Piscataquis County, Maine · 500 SW of JCT RTE 11 · Structure no. 2573

Built
1915
110 years old
Condition
Poor
inspected September 2023
Type
Arch - Deck
Concrete
Length
85 ft
1 main span
Daily traffic
6,037
2016 count
Owner
State
State Highway Agency

About this bridge

Main ST over Sebec River is a concrete arch - deck carrying Main ST over Sebec River in Piscataquis County, Maine. It was built in 1915, so it is 110 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 6,037 vehicles a day, roughly 5% of them trucks, projected to reach 8,452 by 2036. The structure is 85 ft (25.9 m) long and 38 ft wide. If it were closed, the detour would be 29.2 mi (47 km).

Location

Open in Google Maps
CarriesMain ST
CrossesSebec River
Location500 SW of JCT RTE 11
RouteState Highway 6
CountyPiscataquis County
StateMaine
Coordinates45.25106, -68.9875
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating64.3 US tons
Inventory rating49.6 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length85 ft (25.9 m)
Longest span65 ft (19.8 m)
Deck width38 ft (11.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,037 (2016)
Projected traffic8,452 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed29.2 mi (47 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Main ST over Sebec River built?

It was built in 1915, making it 110 years old in 2025.

What condition is Main ST over Sebec River 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 September 2023.

How much traffic does Main ST over Sebec River carry?

About 6,037 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Main ST over Sebec River?

The structure is 85 ft (25.9 m) long with a longest span of 65 ft (19.8 m) and a deck 38 ft wide.

Who owns Main ST over Sebec River?

It is owned by the State Highway Agency.