US Bridges

Nh 84 over I-95

Fair

Rockingham County, New Hampshire · .25 MI N. Seabrook T.L. · Structure no. 011001740004000

Built
1975
50 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
255 ft
2 main spans
Daily traffic
2,868
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

Nh 84 over I-95 is a steel continuous stringer/multi-beam or girder carrying Nh 84 over I-95 in Rockingham County, New Hampshire. It was built in 1975, so it is 50 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 2,868 vehicles a day, roughly 4% of them trucks, projected to reach 4,244 by 2043. The structure is 255 ft (77.7 m) long and 52 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNh 84
CrossesI-95
Location.25 MI N. Seabrook T.L.
RouteState Highway 84
CountyRockingham County
StateNew Hampshire
Coordinates42.90703, -70.87669
Functional classUrban Collector

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.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.1 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length255 ft (77.7 m)
Longest span128 ft (39 m)
Deck width52 ft (15.7 m)
Roadway width44 ft (13.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,868 (2023)
Projected traffic4,244 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

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 Nh 84 over I-95 built?

It was built in 1975, making it 50 years old in 2025.

What condition is Nh 84 over I-95 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 2024.

How much traffic does Nh 84 over I-95 carry?

About 2,868 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Nh 84 over I-95?

The structure is 255 ft (77.7 m) long with a longest span of 128 ft (39 m) and a deck 52 ft wide.

Who owns Nh 84 over I-95?

It is owned by the State Toll Authority.