US Bridges

US 1 NB Ramp over Nhrr(abd)

Fair

Rockingham County, New Hampshire · .1 MI from Jct. Rt 1 · Structure no. 011101620010400

Built
1963
62 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
105 ft
3 main spans
Daily traffic
10,859
2023 count
Owner
State
State Highway Agency

About this bridge

US 1 NB Ramp over Nhrr(abd) is a steel continuous stringer/multi-beam or girder carrying US 1 NB Ramp over Nhrr(abd) in Rockingham County, New Hampshire. It was built in 1963, so it is 62 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 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 10,859 vehicles a day, roughly 4% of them trucks, projected to reach 16,071 by 2043. The structure is 105 ft (32 m) long and 53 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 1 NB Ramp
CrossesNhrr(abd)
Location.1 MI from Jct. Rt 1
RouteU.S. Route 1
CountyRockingham County
StateNew Hampshire
Coordinates42.92988, -70.84334
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating41 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length105 ft (32 m)
Longest span36 ft (11 m)
Deck width53 ft (16.2 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,859 (2023)
Projected traffic16,071 by 2043
Trucks4%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesPedestrian / bicycle
Detour if closed1.2 mi (2 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 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 1 NB Ramp over Nhrr(abd) built?

It was built in 1963, making it 62 years old in 2025.

What condition is US 1 NB Ramp over Nhrr(abd) 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 May 2023.

How much traffic does US 1 NB Ramp over Nhrr(abd) carry?

About 10,859 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is US 1 NB Ramp over Nhrr(abd)?

The structure is 105 ft (32 m) long with a longest span of 36 ft (11 m) and a deck 53 ft wide.

Who owns US 1 NB Ramp over Nhrr(abd)?

It is owned by the State Highway Agency.