US Bridges

West RD over Thorne Brook

Fair

Piscataquis County, Maine · 0.5 MI E of Kingsbury · Structure no. 3760

Built
1952
73 years old
Condition
Fair
inspected October 2023
Type
Tee Beam
Concrete
Length
124 ft
3 main spans
Daily traffic
407
2016 count
Owner
State
State Highway Agency

About this bridge

West RD over Thorne Brook is a concrete tee beam carrying West RD over Thorne Brook in Piscataquis County, Maine. It was built in 1952, so it is 73 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 407 vehicles a day, roughly 5% of them trucks, projected to reach 651 by 2036. The structure is 124 ft (37.9 m) long and 28 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesWest RD
CrossesThorne Brook
Location0.5 MI E of Kingsbury
RouteCounty Highway 16
CountyPiscataquis County
StateMaine
Coordinates45.17119, -69.52645
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating27.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length124 ft (37.9 m)
Longest span47 ft (14.2 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic407 (2016)
Projected traffic651 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 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 West RD over Thorne Brook built?

It was built in 1952, making it 73 years old in 2025.

What condition is West RD over Thorne 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 October 2023.

How much traffic does West RD over Thorne Brook carry?

About 407 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is West RD over Thorne Brook?

The structure is 124 ft (37.9 m) long with a longest span of 47 ft (14.2 m) and a deck 28 ft wide.

Who owns West RD over Thorne Brook?

It is owned by the State Highway Agency.