US Bridges

Vt 00078 Ml over Missisquoi Bay

Good

Grand Isle County, Vermont · 3.0 MI E Jct. U.S.2 · Structure no. 200036000207012

Built
2007
18 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
3,586 ft
23 main spans
Daily traffic
6,300
2018 count
Owner
State
State Highway Agency

About this bridge

Vt 00078 Ml over Missisquoi Bay is a steel continuous stringer/multi-beam or girder carrying Vt 00078 Ml over Missisquoi Bay in Grand Isle County, Vermont. It was built in 2007, so it is 18 years old, younger than the Vermont average of 60.8 years.

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

It carries about 6,300 vehicles a day, roughly 11% of them trucks, projected to reach 6,615 by 2028. The structure is 3,586 ft (1,093 m) long and 46 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

Location

Open in Google Maps
CarriesVt 00078 Ml
CrossesMissisquoi Bay
Location3.0 MI E Jct. U.S.2
RouteState Highway 78
CountyGrand Isle County
StateVermont
Coordinates44.97289, -73.21992
Functional classRural Principal Arterial - Other

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95 US tons
Inventory rating56 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans23
Design loadHS 25 or greater
Structure length3,586 ft (1,093 m)
Longest span155 ft (47.2 m)
Deck width46 ft (14.1 m)
Roadway width42 ft (12.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,300 (2018)
Projected traffic6,615 by 2028
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Vt 00078 Ml over Missisquoi Bay built?

It was built in 2007, making it 18 years old in 2025.

What condition is Vt 00078 Ml over Missisquoi Bay 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 July 2023.

How much traffic does Vt 00078 Ml over Missisquoi Bay carry?

About 6,300 vehicles per day (2018 count), of which roughly 11% are trucks.

How long is Vt 00078 Ml over Missisquoi Bay?

The structure is 3,586 ft (1,093 m) long with a longest span of 155 ft (47.2 m) and a deck 46 ft wide.

Who owns Vt 00078 Ml over Missisquoi Bay?

It is owned by the State Highway Agency.