Structure 6501060013300 · Strafford County, NH

Nh 16 Sp Tpk NB over Cocheco River

Carries Nh 16 Sp Tpk NB over Cocheco River, 3.6 Mi From Rochester Tl..

Overall conditionPoor

Set by its lowest-rated component: Deck and Superstructure at 4 of 9.

How ratings work
Decksets the rating4/9 · Poor
Superstructuresets the rating4/9 · Poor
Substructure6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT267 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9 · sets the ratingSuperstructure 4/9 · sets the ratingSubstructure 6/9

267 ft end to end, longest span 70 ft: about 4 semi-trucks nose to tail. 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.

Built1957rebuilt 1991
Length267.1 ft81.4 m
Daily traffic22,560counted 2023
Last inspectedOctober 2024every 8 months

Location

StateNew Hampshire
CountyStrafford
Location3.6 Mi From Rochester Tl.
CarriesNh 16 Sp Tpk NB
CrossesCocheco River
Coordinates43.20674, -70.89641

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length267.1 ft (81.4 m)
Max Span69.9 ft (21.3 m)
Deck Width44.0 ft (13.4 m)
Deck Area1090.8 sq m
Main Spans4
Year Built1957 (reconstructed 1991)

Traffic

Avg Daily Traffic22,560 (2023)
Truck Traffic8%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 8 months
OwnerState Toll Authority
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical8 — Stable, low risk
Structure Number006501060013300

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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