US Bridges

N River RD over Bobbin Mill Brook

Fair

Androscoggin County, Maine · 1.5 MI from RTE 4 · Structure no. 3339

Built
1936
89 years old
Condition
Fair
inspected June 2024
Type
Tee Beam
Concrete
Length
29 ft
1 main span
Daily traffic
496
2016 count
Owner
State
State Highway Agency

About this bridge

N River RD over Bobbin Mill Brook is a concrete tee beam carrying N River RD over Bobbin Mill Brook in Androscoggin County, Maine. It was built in 1936, so it is 89 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 496 vehicles a day, roughly 5% of them trucks, projected to reach 794 by 2036. The structure is 29 ft (8.8 m) long and 23 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesN River RD
CrossesBobbin Mill Brook
Location1.5 MI from RTE 4
RouteCity Street 0
StateMaine
Coordinates44.12093, -70.21417
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating30.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length29 ft (8.8 m)
Longest span25 ft (7.6 m)
Deck width23 ft (7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic496 (2016)
Projected traffic794 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 N River RD over Bobbin Mill Brook built?

It was built in 1936, making it 89 years old in 2025.

What condition is N River RD over Bobbin Mill 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 June 2024.

How much traffic does N River RD over Bobbin Mill Brook carry?

About 496 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is N River RD over Bobbin Mill Brook?

The structure is 29 ft (8.8 m) long with a longest span of 25 ft (7.6 m) and a deck 23 ft wide.

Who owns N River RD over Bobbin Mill Brook?

It is owned by the State Highway Agency.