US Bridges

Main ST over Blackman Stream

Fair

Penobscot County, Maine · 2 Mi.N. Townline · Structure no. 2612

Built
1966
59 years old
Condition
Fair
inspected August 2023
Type
Culvert
Concrete
Length
26 ft
1 main span
Daily traffic
3,458
2016 count
Owner
State
State Highway Agency

About this bridge

Main ST over Blackman Stream is a concrete culvert carrying Main ST over Blackman Stream in Penobscot County, Maine. It was built in 1966, so it is 59 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 6 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 3,458 vehicles a day, roughly 5% of them trucks, projected to reach 4,841 by 2036. The structure is 26 ft (7.8 m) long. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesMain ST
CrossesBlackman Stream
Location2 Mi.N. Townline
RouteState Highway 178
CountyPenobscot County
StateMaine
Coordinates44.88918, -68.64706
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating37.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20 + Mod
Structure length26 ft (7.8 m)
Longest span23 ft (6.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,458 (2016)
Projected traffic4,841 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Main ST over Blackman Stream built?

It was built in 1966, making it 59 years old in 2025.

What condition is Main ST over Blackman 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 August 2023.

How much traffic does Main ST over Blackman Stream carry?

About 3,458 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Main ST over Blackman Stream?

The structure is 26 ft (7.8 m) long with a longest span of 23 ft (6.9 m).

Who owns Main ST over Blackman Stream?

It is owned by the State Highway Agency.