US Bridges

Route 1 over Tunk Stream

Poor

Washington County, Maine · 1.5 MI E Townline · Structure no. 5956

Built
1962
63 years old
Condition
Poor
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
90 ft
1 main span
Daily traffic
3,819
2016 count
Owner
State
State Highway Agency

About this bridge

Route 1 over Tunk Stream is a steel stringer/multi-beam or girder carrying Route 1 over Tunk Stream in Washington County, Maine. It was built in 1962, so it is 63 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 3,819 vehicles a day, roughly 5% of them trucks, projected to reach 5,347 by 2036. The structure is 90 ft (27.4 m) long and 36 ft wide. If it were closed, the detour would be 44.7 mi (72 km).

Location

Open in Google Maps
CarriesRoute 1
CrossesTunk Stream
Location1.5 MI E Townline
RouteState Highway 1
CountyWashington County
StateMaine
Coordinates44.51256, -67.96294
Functional classRural Minor Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
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 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 rating64.3 US tons
Inventory rating49.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length90 ft (27.4 m)
Longest span85 ft (25.9 m)
Deck width36 ft (11 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,819 (2016)
Projected traffic5,347 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed44.7 mi (72 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Route 1 over Tunk Stream built?

It was built in 1962, making it 63 years old in 2025.

What condition is Route 1 over Tunk Stream 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 September 2023.

How much traffic does Route 1 over Tunk Stream carry?

About 3,819 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Route 1 over Tunk Stream?

The structure is 90 ft (27.4 m) long with a longest span of 85 ft (25.9 m) and a deck 36 ft wide.

Who owns Route 1 over Tunk Stream?

It is owned by the State Highway Agency.