Structure C190202DRDOTNBI · Middlesex County, MA

ST 2 Concord Tpk over Rr Mbta/bmrr

Carries ST 2 Concord Tpk over Rr Mbta/bmrr, 2.6 Km SE Of RTE 62.

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT74 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 5/9 · sets the rating

74 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 box-beam bridge.

Built199135 years old
Length74.1 ft22.6 m
Daily traffic55,260counted 2024
Last inspectedNovember 2024every 24 months

Location

StateMassachusetts
CountyMiddlesex
Location2.6 Km SE Of RTE 62
CarriesST 2 Concord Tpk
CrossesRr Mbta/bmrr
Coordinates42.44539, -71.35073

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length74.1 ft (22.6 m)
Max Span68.9 ft (21 m)
Deck Width77.1 ft (23.5 m)
Deck Area531.1 sq m
Main Spans1
Year Built1991

Traffic

Avg Daily Traffic55,260 (2024)
Truck Traffic9%
Lanes On Bridge4

Inspection & Ownership

Last InspectionNovember 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour CriticalNot applicable
Structure NumberC190202DRDOTNBI

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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