US Bridges

NH101 over US 1 NB

Fair

Rockingham County, New Hampshire · 2.3 Mi. from Jct. I-95 · Structure no. 011101710010900

Built
1963
62 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
131 ft
3 main spans
Daily traffic
7,428
2023 count
Owner
State
State Highway Agency

About this bridge

NH101 over US 1 NB is a steel stringer/multi-beam or girder carrying NH101 over US 1 NB 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 5 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 7,428 vehicles a day, roughly 5% of them trucks, projected to reach 10,993 by 2043. The structure is 131 ft (39.9 m) long and 46 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNH101
CrossesUS 1 NB
Location2.3 Mi. from Jct. I-95
RouteState Highway 51
CountyRockingham County
StateNew Hampshire
Coordinates42.93088, -70.83799
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.8 US tons
Inventory rating29.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length131 ft (39.9 m)
Longest span58 ft (17.7 m)
Deck width46 ft (14 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,428 (2023)
Projected traffic10,993 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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 NH101 over US 1 NB built?

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

What condition is NH101 over US 1 NB 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 NH101 over US 1 NB carry?

About 7,428 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is NH101 over US 1 NB?

The structure is 131 ft (39.9 m) long with a longest span of 58 ft (17.7 m) and a deck 46 ft wide.

Who owns NH101 over US 1 NB?

It is owned by the State Highway Agency.