Structure 28401700015900 · Grafton County, NH

Nh112 Kancamagus over Pemigewasset River

Carries Nh112 Kancamagus over Pemigewasset River, 0.1 Mi E Jct Route 3.

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
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT88 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9 · sets the ratingSuperstructure 4/9 · sets the ratingSubstructure 7/9

88 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 rigid-frame bridge.

Built193393 years old
Length87.9 ft26.8 m
Daily traffic6,210counted 2023
Last inspectedNovember 2024every 8 months

Location

StateNew Hampshire
CountyGrafton
Location0.1 Mi E Jct Route 3
CarriesNh112 Kancamagus
CrossesPemigewasset River
Coordinates44.02996, -71.68491

Physical Characteristics

MaterialConcrete
DesignFrame
Total Length87.9 ft (26.8 m)
Max Span80.1 ft (24.4 m)
Deck Width32.5 ft (9.9 m)
Deck Area265.3 sq m
Main Spans1
Year Built1933

Traffic

Avg Daily Traffic6,210 (2023)
Truck Traffic4%
Lanes On Bridge2

Inspection & Ownership

Last InspectionNovember 2024
Inspection FrequencyEvery 8 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical8 — Stable, low risk
Structure Number028401700015900

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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