Structure 16101440012600 · Hillsborough County, NH

I-93 NB Nh101 EB over Candia Road

Carries I-93 NB Nh101 EB over Candia Road, 2.2 Mi W Jct RT 28 Byp.

Overall conditionFair

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

How ratings work
Decksets the rating5/9 · Fair
Superstructure7/9 · Good
Substructure6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT83 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 7/9Substructure 6/9

83 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.

Built1960rebuilt 1992
Length83.0 ft25.3 m
Daily traffic47,490counted 2023
Last inspectedApril 2023every 24 months

Location

StateNew Hampshire
CountyHillsborough
Location2.2 Mi W Jct RT 28 Byp
CarriesI-93 NB Nh101 EB
CrossesCandia Road
Coordinates42.98390, -71.41542

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length83.0 ft (25.3 m)
Max Span78.1 ft (23.8 m)
Deck Width76.1 ft (23.2 m)
Deck Area587.0 sq m
Main Spans1
Year Built1960 (reconstructed 1992)

Traffic

Avg Daily Traffic47,490 (2023)
Truck Traffic6%
Lanes On Bridge4
Lanes Under Bridge4

Inspection & Ownership

Last InspectionApril 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number016101440012600

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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