Structure 200036000207012 · Grand Isle County, VT

Vt 00078 Ml over Missisquoi Bay

Carries Vt 00078 Ml over Missisquoi Bay, 3.0 Mi E Jct. U.s.2.

Overall conditionGood

Set by its lowest-rated component: Deck at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructure8/9 · Very Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT3,586 FT OVERALL500 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 8/9

3,586 ft end to end, longest span 155 ft: about 10.0 football fields. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.

Built200719 years old
Length3586.0 ft1,093 m
Daily traffic6,300counted 2018
Last inspectedJuly 2023every 24 months

Location

StateVermont
CountyGrand Isle
Location3.0 Mi E Jct. U.s.2
CarriesVt 00078 Ml
CrossesMissisquoi Bay
Coordinates44.97289, -73.21992

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length3586.0 ft (1,093 m)
Max Span154.9 ft (47.2 m)
Deck Width46.3 ft (14.1 m)
Deck Area15411.3 sq m
Main Spans23
Year Built2007

Traffic

Avg Daily Traffic6,300 (2018)
Truck Traffic11%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number200036000207012

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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