US Bridges

I-93 NB over US 3

Good

Grafton County, New Hampshire · 1.7 MI North Woodstock T · Structure no. 014802010009500

Built
1985
40 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
131 ft
1 main span
Daily traffic
5,456
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 NB over US 3 is a steel stringer/multi-beam or girder carrying I-93 NB over US 3 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 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 5,456 vehicles a day, roughly 9% of them trucks, projected to reach 8,074 by 2043. The structure is 131 ft (39.9 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-93 NB
CrossesUS 3
Location1.7 MI North Woodstock T
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates44.06217, -71.68734
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.
Last inspectionMay 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 rating79 US tons
Inventory rating47 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length131 ft (39.9 m)
Longest span127 ft (38.7 m)
Deck width45 ft (13.7 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,456 (2023)
Projected traffic8,074 by 2043
Trucks9%
Lanes on structure2
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 NB over US 3 built?

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

What condition is I-93 NB over US 3 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 May 2023.

How much traffic does I-93 NB over US 3 carry?

About 5,456 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 NB over US 3?

The structure is 131 ft (39.9 m) long with a longest span of 127 ft (38.7 m) and a deck 45 ft wide.

Who owns I-93 NB over US 3?

It is owned by the State Highway Agency.