US Bridges

NH101 over US 1 SB

Fair

Rockingham County, New Hampshire · 2.3 Mi. from Jct. Rt 95 · Structure no. 011101650011300

Built
1963
62 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
121 ft
3 main spans
Daily traffic
8,642
2023 count
Owner
State
State Highway Agency

About this bridge

NH101 over US 1 SB is a steel continuous stringer/multi-beam or girder carrying NH101 over US 1 SB 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 8,642 vehicles a day, roughly 5% of them trucks, projected to reach 12,790 by 2043. The structure is 121 ft (36.9 m) long and 50 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNH101
CrossesUS 1 SB
Location2.3 Mi. from Jct. Rt 95
RouteState Highway 51
CountyRockingham County
StateNew Hampshire
Coordinates42.93251, -70.84081
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.5 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length121 ft (36.9 m)
Longest span49 ft (14.9 m)
Deck width50 ft (15.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,642 (2023)
Projected traffic12,790 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 SB built?

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

What condition is NH101 over US 1 SB 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 SB carry?

About 8,642 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is NH101 over US 1 SB?

The structure is 121 ft (36.9 m) long with a longest span of 49 ft (14.9 m) and a deck 50 ft wide.

Who owns NH101 over US 1 SB?

It is owned by the State Highway Agency.