US Bridges

I-93 SB NH101 WB over Candia Road

Fair

Hillsborough County, New Hampshire · 2.2 MI W JCT Rt 28 Bypass · Structure no. 016101440012500

Built
1960
65 years old, rebuilt 1978
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
84 ft
1 main span
Daily traffic
47,490
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 SB NH101 WB over Candia Road is a steel stringer/multi-beam or girder carrying I-93 SB NH101 WB over Candia Road in Hillsborough County, New Hampshire. It was built in 1960 and reconstructed in 1978, so it is 65 years old, older than the New Hampshire average of 56.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 47,490 vehicles a day, roughly 6% of them trucks, projected to reach 70,285 by 2043. The structure is 84 ft (25.6 m) long and 73 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-93 SB NH101 WB
CrossesCandia Road
Location2.2 MI W JCT Rt 28 Bypass
RouteInterstate 93
CountyHillsborough County
StateNew Hampshire
Coordinates42.98379, -71.41566
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.8 US tons
Inventory rating33.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length84 ft (25.6 m)
Longest span77 ft (23.5 m)
Deck width73 ft (22.3 m)
Roadway width70 ft (21.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic47,490 (2023)
Projected traffic70,285 by 2043
Trucks6%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$314,000 (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-93 SB NH101 WB over Candia Road built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1978.

What condition is I-93 SB NH101 WB over Candia Road in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.

How much traffic does I-93 SB NH101 WB over Candia Road carry?

About 47,490 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-93 SB NH101 WB over Candia Road?

The structure is 84 ft (25.6 m) long with a longest span of 77 ft (23.5 m) and a deck 73 ft wide.

Who owns I-93 SB NH101 WB over Candia Road?

It is owned by the State Highway Agency.