Structure 4701320009700 · Sullivan County, NH

Nh 11 Nh103 over Sugar River

Carries Nh 11 Nh103 over Sugar River, 4.4 Mi From Vermont Sl.

Overall conditionFair

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

How ratings work
Decksets the rating5/9 · Fair
Superstructure7/9 · Good
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT133 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 7/9Substructure 7/9

133 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 multi-beam bridge.

Built198145 years old
Length132.9 ft40.5 m
Daily traffic13,248counted 2023
Last inspectedSeptember 2023every 24 months

Location

StateNew Hampshire
CountySullivan
Location4.4 Mi From Vermont Sl
CarriesNh 11 Nh103
CrossesSugar River
Coordinates43.37373, -72.33643

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length132.9 ft (40.5 m)
Max Span128.0 ft (39 m)
Deck Width76.4 ft (23.3 m)
Deck Area943.6 sq m
Main Spans1
Year Built1981

Traffic

Avg Daily Traffic13,248 (2023)
Truck Traffic5%
Lanes On Bridge4

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical8 — Stable, low risk
Structure Number004701320009700

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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