Structure M0200632GDOT634 · Essex County, MA

HWY Harbor ST over Rr Mbta

Carries HWY Harbor ST over Rr Mbta, .25 Miles E ST 127.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating5/9 · Fair
Substructure6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT40 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 5/9 · sets the ratingSubstructure 6/9

40 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 multi-beam bridge.

Built1936rebuilt 1985
Length40.0 ft12.2 m
Daily traffic900counted 2018
Last inspectedJanuary 2024every 24 months

Location

StateMassachusetts
CountyEssex
Location.25 Miles E ST 127
CarriesHWY Harbor ST
CrossesRr Mbta
Coordinates42.56643, -70.78340

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length40.0 ft (12.2 m)
Max Span36.1 ft (11 m)
Deck Width34.8 ft (10.6 m)
Deck Area129.3 sq m
Main Spans1
Year Built1936 (reconstructed 1985)

Traffic

Avg Daily Traffic900 (2018)
Truck Traffic17%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJanuary 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure NumberM0200632GDOT634

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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