Structure 16101400006200 · Hillsborough County, NH

Nh 3a So Main ST over Piscataquog River

Carries Nh 3a So Main ST over Piscataquog River, 0.04 Mi From Varney ST.

Overall conditionGood

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

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT82 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

82 ft end to end, longest span 38 ft. 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.

Built1894rebuilt 2003
Length82.0 ft25 m
Daily traffic12,740counted 2023
Last inspectedJuly 2024every 24 months

Location

StateNew Hampshire
CountyHillsborough
Location0.04 Mi From Varney ST
CarriesNh 3a So Main ST
CrossesPiscataquog River
Coordinates42.98086, -71.47599

Physical Characteristics

MaterialMasonry
DesignArch - Deck
Total Length82.0 ft (25 m)
Max Span38.1 ft (11.6 m)
Deck Width49.9 ft (15.2 m)
Deck Area380 sq m
Main Spans2
Year Built1894 (reconstructed 2003)

Traffic

Avg Daily Traffic12,740 (2023)
Truck Traffic5%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number016101400006200

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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