US Bridges

I-93 NB over Stonehenge Road

Good

Rockingham County, New Hampshire · 1.0 MI S JCT Rt 28 · Structure no. 015401140014400

Built
1995
30 years old, rebuilt 2019
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
73 ft
1 main span
Daily traffic
36,675
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 NB over Stonehenge Road is a prestressed concrete stringer/multi-beam or girder carrying I-93 NB over Stonehenge Road in Rockingham County, New Hampshire. It was built in 1995 and reconstructed in 2019, so it is 30 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 36,675 vehicles a day, roughly 7% of them trucks, projected to reach 54,279 by 2043. The structure is 73 ft (22.4 m) long and 83 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesI-93 NB
CrossesStonehenge Road
Location1.0 MI S JCT Rt 28
RouteInterstate 93
CountyRockingham County
StateNew Hampshire
Coordinates42.90277, -71.36337
Functional classUrban 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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJune 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 rating61.7 US tons
Inventory rating47.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length73 ft (22.4 m)
Longest span69 ft (21 m)
Deck width83 ft (25.3 m)
Roadway width79 ft (24.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,675 (2023)
Projected traffic54,279 by 2043
Trucks7%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.2 mi (10 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 Stonehenge Road built?

It was built in 1995, making it 30 years old in 2025. It was reconstructed in 2019.

What condition is I-93 NB over Stonehenge 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 June 2023.

How much traffic does I-93 NB over Stonehenge Road carry?

About 36,675 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-93 NB over Stonehenge Road?

The structure is 73 ft (22.4 m) long with a longest span of 69 ft (21 m) and a deck 83 ft wide.

Who owns I-93 NB over Stonehenge Road?

It is owned by the State Highway Agency.