Structure 9101210010200 · Belknap County, NH

Nh 11b over Gunstock River

Carries Nh 11b over Gunstock River, 0.6 Mi N Jct Nh 11-a.

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 overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
25 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9 · sets the ratingSuperstructure 4/9 · sets the ratingSubstructure 6/9

25 ft end to end. Lengths are drawn to scale; at this length a semi-truck would be a speck. 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 slab bridge.

Built194185 years old
Length24.9 ft7.6 m
Daily traffic2,690counted 2023
Last inspectedNovember 2024every 8 months

Location

StateNew Hampshire
CountyBelknap
Location0.6 Mi N Jct Nh 11-a
CarriesNh 11b
CrossesGunstock River
Coordinates43.56401, -71.39798

Physical Characteristics

MaterialConcrete
DesignSlab
Total Length24.9 ft (7.6 m)
Max Span23.0 ft (7 m)
Deck Width27.9 ft (8.5 m)
Deck Area64.6 sq m
Main Spans1
Year Built1941

Traffic

Avg Daily Traffic2,690 (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 Number009101210010200

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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