US Bridges

School ST over Alder Bk

Poor

Franklin County, Maine · 1.8 MI NW Washington Twp · Structure no. 5364

Built
1926
99 years old, rebuilt 1954
Condition
Poor
inspected March 2024
Type
Slab
Concrete
Length
29 ft
1 main span
Daily traffic
709
2016 count
Owner
State
State Highway Agency

About this bridge

School ST over Alder Bk is a concrete slab carrying School ST over Alder Bk in Franklin County, Maine. It was built in 1926 and reconstructed in 1954, so it is 99 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 709 vehicles a day, roughly 5% of them trucks, projected to reach 1,134 by 2036. The structure is 29 ft (8.9 m) long and 34 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

Open in Google Maps
CarriesSchool ST
CrossesAlder Bk
Location1.8 MI NW Washington Twp
RouteCounty Highway 156
CountyFranklin County
StateMaine
Coordinates44.67377, -70.37015
Functional classRural Major 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36.8 US tons
Inventory rating28.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length29 ft (8.9 m)
Longest span26 ft (7.9 m)
Deck width34 ft (10.5 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic709 (2016)
Projected traffic1,134 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 School ST over Alder Bk built?

It was built in 1926, making it 99 years old in 2025. It was reconstructed in 1954.

What condition is School ST over Alder Bk 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 March 2024.

How much traffic does School ST over Alder Bk carry?

About 709 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is School ST over Alder Bk?

The structure is 29 ft (8.9 m) long with a longest span of 26 ft (7.9 m) and a deck 34 ft wide.

Who owns School ST over Alder Bk?

It is owned by the State Highway Agency.