US Bridges

I-95 NB over US 4 Nh 16 SP Tpk

Fair

Rockingham County, New Hampshire · I-95 SP Tpk Interchange · Structure no. 021701970012200

Built
1971
54 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
127 ft
1 main span
Daily traffic
38,772
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

I-95 NB over US 4 Nh 16 SP Tpk is a steel stringer/multi-beam or girder carrying I-95 NB over US 4 Nh 16 SP Tpk in Rockingham County, New Hampshire. It was built in 1971, so it is 54 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 38,772 vehicles a day, roughly 6% of them trucks, projected to reach 57,382 by 2043. The structure is 127 ft (38.7 m) long and 74 ft wide.

Location

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CarriesI-95 NB
CrossesUS 4 Nh 16 SP Tpk
LocationI-95 SP Tpk Interchange
RouteInterstate 95
CountyRockingham County
StateNew Hampshire
Coordinates43.07421, -70.78246
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.4 US tons
Inventory rating34.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length127 ft (38.7 m)
Longest span122 ft (37.2 m)
Deck width74 ft (22.6 m)
Roadway width70 ft (21.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,772 (2023)
Projected traffic57,382 by 2043
Trucks6%
Lanes on structure3
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 Toll Authority
Maintained byState Toll Authority
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-95 NB over US 4 Nh 16 SP Tpk built?

It was built in 1971, making it 54 years old in 2025.

What condition is I-95 NB over US 4 Nh 16 SP Tpk 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 June 2023.

How much traffic does I-95 NB over US 4 Nh 16 SP Tpk carry?

About 38,772 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-95 NB over US 4 Nh 16 SP Tpk?

The structure is 127 ft (38.7 m) long with a longest span of 122 ft (37.2 m) and a deck 74 ft wide.

Who owns I-95 NB over US 4 Nh 16 SP Tpk?

It is owned by the State Toll Authority.