US Bridges

I-93 NB over Pemigewasset River

Good

Grafton County, New Hampshire · 0.1 MI Campton Tl · Structure no. 025402470008000

Built
1969
56 years old, rebuilt 2002
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
409 ft
3 main spans
Daily traffic
7,498
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 NB over Pemigewasset River is a steel continuous stringer/multi-beam or girder carrying I-93 NB over Pemigewasset River in Grafton County, New Hampshire. It was built in 1969 and reconstructed in 2002, so it is 56 years old, younger than the New Hampshire average of 56.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 7,498 vehicles a day, roughly 10% of them trucks, projected to reach 11,097 by 2043. The structure is 409 ft (124.7 m) long and 44 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

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CarriesI-93 NB
CrossesPemigewasset River
Location0.1 MI Campton Tl
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates43.86775, -71.66441
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.7 US tons
Inventory rating52.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length409 ft (124.7 m)
Longest span155 ft (47.2 m)
Deck width44 ft (13.5 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,498 (2023)
Projected traffic11,097 by 2043
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-93 NB over Pemigewasset River built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 2002.

What condition is I-93 NB over Pemigewasset River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does I-93 NB over Pemigewasset River carry?

About 7,498 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is I-93 NB over Pemigewasset River?

The structure is 409 ft (124.7 m) long with a longest span of 155 ft (47.2 m) and a deck 44 ft wide.

Who owns I-93 NB over Pemigewasset River?

It is owned by the State Highway Agency.