Structure 11400400004300 · Grafton County, NH

Nh 10 over Mink Brook

Carries Nh 10 over Mink Brook, 0.2 Mi From Lebanon Tl.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT48 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

48 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 slab bridge.

Built200620 years old
Length47.9 ft14.6 m
Daily traffic6,198counted 2023
Last inspectedApril 2024every 24 months

Location

StateNew Hampshire
CountyGrafton
Location0.2 Mi From Lebanon Tl
CarriesNh 10
CrossesMink Brook
Coordinates43.69292, -72.29056

Physical Characteristics

MaterialPrestressed Concrete
DesignSlab
Total Length47.9 ft (14.6 m)
Max Span47.9 ft (14.6 m)
Deck Width42.0 ft (12.8 m)
Deck Area186.9 sq m
Main Spans1
Year Built2006

Traffic

Avg Daily Traffic6,198 (2023)
Truck Traffic6%
Lanes On Bridge2

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number011400400004300

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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