Structure 2302350006100 · Coos County, NH

Nh 16 SB over Dead River

Carries Nh 16 SB over Dead River, 1.5 Mi N Of Gorham Tl.

Overall conditionGood

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

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
24 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 7/9 · sets the rating

24 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 box-beam bridge.

Built1931rebuilt 1995
Length24.0 ft7.3 m
Daily traffic4,241counted 2023
Last inspectedAugust 2024every 24 months

Location

StateNew Hampshire
CountyCoos
Location1.5 Mi N Of Gorham Tl
CarriesNh 16 SB
CrossesDead River
Coordinates44.46974, -71.18210

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length24.0 ft (7.3 m)
Max Span22.0 ft (6.7 m)
Deck Width51.5 ft (15.7 m)
Deck Area114.6 sq m
Main Spans1
Year Built1931 (reconstructed 1995)

Traffic

Avg Daily Traffic4,241 (2023)
Truck Traffic5%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical8 — Stable, low risk
Structure Number002302350006100

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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