US Bridges

C4012 over Coaticook River

FairPosted for load

Essex County, Vermont · 0.4 MI to JCT W VT114 · Structure no. 100516000405161

Built
1978
47 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
42 ft
1 main span
Daily traffic
2
2019 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

C4012 over Coaticook River is a steel stringer/multi-beam or girder carrying C4012 over Coaticook River in Essex County, Vermont. It was built in 1978, so it is 47 years old, younger than the Vermont average of 60.8 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. Its operating status is: posted for load restriction.

It carries about 2 vehicles a day, roughly 2% of them trucks, projected to reach 3 by 2029. The structure is 42 ft (12.8 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesC4012
CrossesCoaticook River
Location0.4 MI to JCT W VT114
CountyEssex County
StateVermont
Coordinates44.98225, -71.82121
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26 US tons
Inventory rating16 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length42 ft (12.8 m)
Longest span40 ft (12.2 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2 (2019)
Projected traffic3 by 2029
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$515,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was C4012 over Coaticook River built?

It was built in 1978, making it 47 years old in 2025.

What condition is C4012 over Coaticook River 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 C4012 over Coaticook River carry?

About 2 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is C4012 over Coaticook River?

The structure is 42 ft (12.8 m) long with a longest span of 40 ft (12.2 m) and a deck 16 ft wide.

Who owns C4012 over Coaticook River?

It is owned by the Town or Township Highway Agency.