US Bridges

Unity RD over 15 Mile Stream

Good

Kennebec County, Maine · 1.9 MI Wly Unity Twp T L · Structure no. 5069

Built
2014
11 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
123 ft
1 main span
Daily traffic
2,364
2016 count
Owner
State
State Highway Agency

About this bridge

Unity RD over 15 Mile Stream is a steel continuous stringer/multi-beam or girder carrying Unity RD over 15 Mile Stream in Kennebec County, Maine. It was built in 2014, so it is 11 years old, younger than the Maine average of 53.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,364 vehicles a day, roughly 5% of them trucks, projected to reach 3,310 by 2036. The structure is 123 ft (37.5 m) long and 33 ft wide. If it were closed, the detour would be 26.1 mi (42 km).

CarriesUnity RD
Crosses15 Mile Stream
Location1.9 MI Wly Unity Twp T L
RouteState Highway 139
StateMaine
Coordinates44.60167, -69.46854
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
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 rating60 US tons
Inventory rating36 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length123 ft (37.5 m)
Longest span120 ft (36.6 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,364 (2016)
Projected traffic3,310 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.1 mi (42 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 Unity RD over 15 Mile Stream built?

It was built in 2014, making it 11 years old in 2025.

What condition is Unity RD over 15 Mile Stream in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does Unity RD over 15 Mile Stream carry?

About 2,364 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Unity RD over 15 Mile Stream?

The structure is 123 ft (37.5 m) long with a longest span of 120 ft (36.6 m) and a deck 33 ft wide.

Who owns Unity RD over 15 Mile Stream?

It is owned by the State Highway Agency.