Structure 6501320010100 · Strafford County, NH

Nh 16 Sp Tpk SB over Nh108 Csx(abd)

Carries Nh 16 Sp Tpk SB over Nh108 Csx(abd), 0.2 Mi From Jct. RT 16.

Overall conditionPoor

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

How ratings work
Decksets the rating4/9 · Poor
Superstructure6/9 · Satisfactory
Substructure5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT300 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9 · sets the ratingSuperstructure 6/9Substructure 5/9

300 ft end to end, longest span 62 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 1999
Length299.9 ft91.4 m
Daily traffic21,323counted 2023
Last inspectedOctober 2024every 8 months

Location

StateNew Hampshire
CountyStrafford
Location0.2 Mi From Jct. RT 16
CarriesNh 16 Sp Tpk SB
CrossesNh108 Csx(abd)
Coordinates43.18141, -70.87699

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length299.9 ft (91.4 m)
Max Span62.0 ft (18.9 m)
Deck Width47.9 ft (14.6 m)
Deck Area1334.4 sq m
Main Spans6
Year Built1957 (reconstructed 1999)

Traffic

Avg Daily Traffic21,323 (2023)
Truck Traffic8%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 8 months
OwnerState Toll Authority
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour CriticalNot applicable
Structure Number006501320010100

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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