US Bridges

I-93 NB over Fordway Extension

Good

Rockingham County, New Hampshire · 0.8 MI So. Londonderry Tl · Structure no. 006300650006000

Built
1962
63 years old, rebuilt 2021
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
110 ft
3 main spans
Daily traffic
41,528
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 NB over Fordway Extension is a steel continuous stringer/multi-beam or girder carrying I-93 NB over Fordway Extension in Rockingham County, New Hampshire. It was built in 1962 and reconstructed in 2021, so it is 63 years old, older 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 41,528 vehicles a day, roughly 9% of them trucks, projected to reach 61,461 by 2043. The structure is 110 ft (33.5 m) long and 75 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesI-93 NB
CrossesFordway Extension
Location0.8 MI So. Londonderry Tl
RouteInterstate 93
CountyRockingham County
StateNew Hampshire
Coordinates42.85565, -71.31876
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionMarch 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 rating63.5 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length110 ft (33.5 m)
Longest span46 ft (13.9 m)
Deck width75 ft (22.9 m)
Roadway width71 ft (21.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,528 (2023)
Projected traffic61,461 by 2043
Trucks9%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed11.8 mi (19 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 Fordway Extension built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2021.

What condition is I-93 NB over Fordway Extension 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 March 2023.

How much traffic does I-93 NB over Fordway Extension carry?

About 41,528 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 NB over Fordway Extension?

The structure is 110 ft (33.5 m) long with a longest span of 46 ft (13.9 m) and a deck 75 ft wide.

Who owns I-93 NB over Fordway Extension?

It is owned by the State Highway Agency.