US Bridges

Unionville RD over Tunk Stream

Fair

Washington County, Maine · 5.8 MI N JCT US 1 · Structure no. 5447

Built
1952
73 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
31 ft
1 main span
Daily traffic
221
2016 count
Owner
State
State Highway Agency

About this bridge

Unionville RD over Tunk Stream is a concrete slab carrying Unionville RD over Tunk Stream in Washington 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 221 vehicles a day, roughly 5% of them trucks, projected to reach 354 by 2036. The structure is 31 ft (9.6 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUnionville RD
CrossesTunk Stream
Location5.8 MI N JCT US 1
RouteCity Street 0
CountyWashington County
StateMaine
Coordinates44.58031, -67.98955
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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
ScourCountermeasures installed to correct a previously existing problem
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating107.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length31 ft (9.6 m)
Longest span29 ft (8.8 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic221 (2016)
Projected traffic354 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Unionville RD over Tunk Stream built?

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

What condition is Unionville RD over Tunk Stream 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 September 2023.

How much traffic does Unionville RD over Tunk Stream carry?

About 221 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Unionville RD over Tunk Stream?

The structure is 31 ft (9.6 m) long with a longest span of 29 ft (8.8 m) and a deck 28 ft wide.

Who owns Unionville RD over Tunk Stream?

It is owned by the State Highway Agency.