US Bridges

I-93 Parkway NB over Trail Pemigewasset River

Fair

Grafton County, New Hampshire · 5.0 MI No Woodstock Tl · Structure no. 014801330010900

Built
1985
40 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
115 ft
1 main span
Daily traffic
5,809
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 Parkway NB over Trail Pemigewasset River is a steel stringer/multi-beam or girder carrying I-93 Parkway NB over Trail Pemigewasset River in Grafton County, New Hampshire. It was built in 1985, so it is 40 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 fair condition with a lowest component rating of 6 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 5,809 vehicles a day, roughly 9% of them trucks, projected to reach 8,597 by 2043. The structure is 115 ft (35.1 m) long and 41 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

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CarriesI-93 Parkway NB
CrossesTrail Pemigewasset River
Location5.0 MI No Woodstock Tl
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates44.11036, -71.68199
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.1 US tons
Inventory rating48.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length115 ft (35.1 m)
Longest span108 ft (32.9 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,809 (2023)
Projected traffic8,597 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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 Parkway NB over Trail Pemigewasset River built?

It was built in 1985, making it 40 years old in 2025.

What condition is I-93 Parkway NB over Trail Pemigewasset River 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 May 2023.

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

About 5,809 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 Parkway NB over Trail Pemigewasset River?

The structure is 115 ft (35.1 m) long with a longest span of 108 ft (32.9 m) and a deck 41 ft wide.

Who owns I-93 Parkway NB over Trail Pemigewasset River?

It is owned by the State Highway Agency.