US Bridges

US 4 Nh 16 SP Tpk over NB Ramp

Good

Rockingham County, New Hampshire · N SP Tpk I-95 Interchange · Structure no. 021701990013900

Built
1971
54 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
144 ft
1 main span
Daily traffic
12,881
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

US 4 Nh 16 SP Tpk over NB Ramp is a steel stringer/multi-beam or girder carrying US 4 Nh 16 SP Tpk over NB Ramp 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 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 12,881 vehicles a day, roughly 8% of them trucks, projected to reach 19,063 by 2043. The structure is 144 ft (44 m) long and 45 ft wide.

Location

Open in Google Maps
CarriesUS 4 Nh 16 SP Tpk
CrossesNB Ramp
LocationN SP Tpk I-95 Interchange
RouteU.S. Route 4
CountyRockingham County
StateNew Hampshire
Coordinates43.07897, -70.78912
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionJune 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 rating54 US tons
Inventory rating32.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length144 ft (44 m)
Longest span140 ft (42.7 m)
Deck width45 ft (13.7 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,881 (2023)
Projected traffic19,063 by 2043
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
Historic statusPossibly eligible for the National Register; requires further investigation
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 US 4 Nh 16 SP Tpk over NB Ramp built?

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

What condition is US 4 Nh 16 SP Tpk over NB Ramp 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 US 4 Nh 16 SP Tpk over NB Ramp carry?

About 12,881 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is US 4 Nh 16 SP Tpk over NB Ramp?

The structure is 144 ft (44 m) long with a longest span of 140 ft (42.7 m) and a deck 45 ft wide.

Who owns US 4 Nh 16 SP Tpk over NB Ramp?

It is owned by the State Toll Authority.