Structure 20950820008700 · Coos County, NH

Old Nh 16 over Thompson Brook

Carries Old Nh 16 over Thompson Brook, 0.2 Mi East Jct Nh 16.

Overall conditionPoor

Set by its lowest-rated component: Superstructure at 4 of 9.

How ratings work
Deck5/9 · Fair
Superstructuresets the rating4/9 · Poor
Substructure6/9 · Satisfactory
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT38 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 4/9 · sets the ratingSubstructure 6/9

38 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 multi-beam bridge.

Built193195 years old
Length38.4 ft11.7 m
Daily traffic5counted 2007
Last inspectedNovember 2024every 8 months

Location

StateNew Hampshire
CountyCoos
Location0.2 Mi East Jct Nh 16
CarriesOld Nh 16
CrossesThompson Brook
Coordinates44.26765, -71.23494

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length38.4 ft (11.7 m)
Max Span34.1 ft (10.4 m)
Deck Width27.2 ft (8.3 m)
Deck Area97.1 sq m
Main Spans1
Year Built1931

Traffic

Avg Daily Traffic5 (2007)
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 Number020950820008700

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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