Structure 13201480005000 · Carroll County, NH

Nh 16a over Ellis River

Carries Nh 16a over Ellis River, .05 Mi N Of Jct 16.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating5/9 · Fair
Substructuresets the rating5/9 · Fair
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT121 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 5/9 · sets the ratingSubstructure 5/9 · sets the rating

121 ft end to end. Lengths and the semi-truck 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 through truss.

Built1876rebuilt 2004
Length121.1 ft36.9 m
Daily traffic2,280counted 2023
Last inspectedSeptember 2024every 24 months

Location

StateNew Hampshire
CountyCarroll
Location.05 Mi N Of Jct 16
CarriesNh 16a
CrossesEllis River
Coordinates44.14153, -71.18625

Physical Characteristics

MaterialWood or Timber
DesignTruss - Thru
Total Length121.1 ft (36.9 m)
Max Span103.0 ft (31.4 m)
Deck Width25.9 ft (7.9 m)
Deck Area291.5 sq m
Main Spans1
Year Built1876 (reconstructed 2004)

Traffic

Avg Daily Traffic2,280 (2023)
Truck Traffic10%
Lanes On Bridge1

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number013201480005000

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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