US Bridges

Center ST over Mattawamkeag River

Poor

Penobscot County, Maine · 0.5 MI S of Reed Plt · Structure no. 5105

Built
1928
97 years old
Condition
Poor
inspected December 2024
Type
Tee Beam
Concrete
Length
245 ft
5 main spans
Daily traffic
123
2016 count
Owner
State
State Highway Agency

About this bridge

Center ST over Mattawamkeag River is a concrete tee beam carrying Center ST over Mattawamkeag River in Penobscot County, Maine. It was built in 1928, so it is 97 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 123 vehicles a day, roughly 5% of them trucks, projected to reach 197 by 2036. The structure is 245 ft (74.7 m) long and 23 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

CarriesCenter ST
CrossesMattawamkeag River
Location0.5 MI S of Reed Plt
RouteCounty Highway 171
StateMaine
Coordinates45.63051, -68.06994
Functional classRural Minor Collector

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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.3 US tons
Inventory rating35.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length245 ft (74.7 m)
Longest span45 ft (13.7 m)
Deck width23 ft (7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic123 (2016)
Projected traffic197 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 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 Center ST over Mattawamkeag River built?

It was built in 1928, making it 97 years old in 2025.

What condition is Center ST over Mattawamkeag 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 December 2024.

How much traffic does Center ST over Mattawamkeag River carry?

About 123 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Center ST over Mattawamkeag River?

The structure is 245 ft (74.7 m) long with a longest span of 45 ft (13.7 m) and a deck 23 ft wide.

Who owns Center ST over Mattawamkeag River?

It is owned by the State Highway Agency.