US Bridges

I-93 NB over Wallace Hill Road

Good

Grafton County, New Hampshire · 3.4 MI JCT RTE 141 · Structure no. 008700530012300

Built
1973
52 years old, rebuilt 1991
Condition
Good
inspected May 2023
Type
Frame
Concrete
Length
58 ft
1 main span
Daily traffic
2,316
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 NB over Wallace Hill Road is a concrete frame carrying I-93 NB over Wallace Hill Road in Grafton County, New Hampshire. It was built in 1973 and reconstructed in 1991, so it is 52 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 2,316 vehicles a day, roughly 9% of them trucks, projected to reach 3,427 by 2043. The structure is 58 ft (17.7 m) long and 60 ft wide.

Location

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CarriesI-93 NB
CrossesWallace Hill Road
Location3.4 MI JCT RTE 141
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates44.22841, -71.74679
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating88.7 US tons
Inventory rating53.1 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length58 ft (17.7 m)
Longest span51 ft (15.5 m)
Deck width60 ft (18.2 m)
Roadway width57 ft (17.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,316 (2023)
Projected traffic3,427 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 Wallace Hill Road built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 1991.

What condition is I-93 NB over Wallace Hill Road 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 Wallace Hill Road carry?

About 2,316 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 NB over Wallace Hill Road?

The structure is 58 ft (17.7 m) long with a longest span of 51 ft (15.5 m) and a deck 60 ft wide.

Who owns I-93 NB over Wallace Hill Road?

It is owned by the State Highway Agency.