US Bridges

Purple Heart HWY over Stantial Brook

Fair

Waldo County, Maine · 0.4 MI SE of Knox · Structure no. 2945

Built
1954
71 years old
Condition
Fair
inspected August 2024
Type
Slab
Concrete
Length
26 ft
1 main span
Daily traffic
1,122
2016 count
Owner
State
State Highway Agency

About this bridge

Purple Heart HWY over Stantial Brook is a concrete slab carrying Purple Heart HWY over Stantial Brook in Waldo County, Maine. It was built in 1954, so it is 71 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,122 vehicles a day, roughly 5% of them trucks, projected to reach 1,683 by 2036. The structure is 26 ft (7.8 m) long and 35 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesPurple Heart HWY
CrossesStantial Brook
Location0.4 MI SE of Knox
RouteCounty Highway 139
CountyWaldo County
StateMaine
Coordinates44.54214, -69.16683
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, 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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39.7 US tons
Inventory rating32.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length26 ft (7.8 m)
Longest span20 ft (6.1 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,122 (2016)
Projected traffic1,683 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 Purple Heart HWY over Stantial Brook built?

It was built in 1954, making it 71 years old in 2025.

What condition is Purple Heart HWY over Stantial Brook 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 August 2024.

How much traffic does Purple Heart HWY over Stantial Brook carry?

About 1,122 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Purple Heart HWY over Stantial Brook?

The structure is 26 ft (7.8 m) long with a longest span of 20 ft (6.1 m) and a deck 35 ft wide.

Who owns Purple Heart HWY over Stantial Brook?

It is owned by the State Highway Agency.