Structure 27201090012400 · Cheshire County, NH

Nh 63 over Mill Brook

Carries Nh 63 over Mill Brook, 1.3 Mi From Jct RTE 12.

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
Channelnot part of overall4/9 · Poor
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT30 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 5/9 · sets the rating

30 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 deck arch.

Built1930rebuilt 1986
Length29.9 ft9.1 m
Daily traffic1,044counted 2023
Last inspectedJune 2024every 24 months

Location

StateNew Hampshire
CountyCheshire
Location1.3 Mi From Jct RTE 12
CarriesNh 63
CrossesMill Brook
Coordinates42.99159, -72.44543

Physical Characteristics

MaterialConcrete
DesignArch - Deck
Total Length29.9 ft (9.1 m)
Max Span29.9 ft (9.1 m)
Deck Width31.8 ft (9.7 m)
Deck Area88.3 sq m
Main Spans1
Year Built1930 (reconstructed 1986)

Traffic

Avg Daily Traffic1,044 (2023)
Truck Traffic4%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical8 — Stable, low risk
Structure Number027201090012400

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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