Structure B170275YKDOTNBI · Barnstable County, MA

ST 3 NB over US 6

Carries ST 3 NB over US 6, @ Cape Cod Canal.

Overall conditionGood

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

How ratings work
Deck8/9 · Very Good
Superstructuresets the rating7/9 · Good
Substructure8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT116 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 7/9 · sets the ratingSubstructure 8/9

116 ft end to end. Lengths and the car 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 tee-beam bridge.

Built200620 years old
Length116.1 ft35.4 m
Daily traffic26,567counted 2023
Last inspectedNovember 2024every 24 months

Location

StateMassachusetts
CountyBarnstable
Location@ Cape Cod Canal
CarriesST 3 NB
CrossesUS 6
Coordinates41.78237, -70.54343

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length116.1 ft (35.4 m)
Max Span105.6 ft (32.2 m)
Deck Width47.9 ft (14.6 m)
Deck Area516.8 sq m
Main Spans1
Year Built2006

Traffic

Avg Daily Traffic26,567 (2023)
Truck Traffic3%
Lanes On Bridge3
Lanes Under Bridge3

Inspection & Ownership

Last InspectionNovember 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure NumberB170275YKDOTNBI

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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