Structure 5001720007200 · Coos County, NH

Diamond Pond Road over Mohawk River

Carries Diamond Pond Road over Mohawk River, 0.14 Mi NE Jct Nh 26.

Overall conditionFair

Set by its lowest-rated component: Deck and Superstructure at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT70 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 7/9

70 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.

Built192997 years old
Length69.9 ft21.3 m
Daily traffic438counted 2023
Last inspectedApril 2024every 24 months

Location

StateNew Hampshire
CountyCoos
Location0.14 Mi NE Jct Nh 26
CarriesDiamond Pond Road
CrossesMohawk River
Coordinates44.87667, -71.37127

Physical Characteristics

MaterialConcrete
DesignArch - Deck
Total Length69.9 ft (21.3 m)
Max Span69.9 ft (21.3 m)
Deck Width26.2 ft (8 m)
Deck Area170.4 sq m
Main Spans1
Year Built1929

Traffic

Avg Daily Traffic438 (2023)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical8 — Stable, low risk
Structure Number005001720007200

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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