US Bridges

US 1 SB over Nhrr(abd)

Fair

Rockingham County, New Hampshire · .1 Mi. from JCT Rt 101 by · Structure no. 011101620011200

Built
1936
89 years old, rebuilt 1994
Condition
Fair
inspected May 2023
Type
Tee Beam
Concrete
Length
49 ft
1 main span
Daily traffic
11,581
2023 count
Owner
State
State Highway Agency

About this bridge

US 1 SB over Nhrr(abd) is a concrete tee beam carrying US 1 SB over Nhrr(abd) in Rockingham County, New Hampshire. It was built in 1936 and reconstructed in 1994, so it is 89 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 11,581 vehicles a day, roughly 5% of them trucks, projected to reach 17,139 by 2043. The structure is 49 ft (14.9 m) long and 43 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUS 1 SB
CrossesNhrr(abd)
Location.1 Mi. from JCT Rt 101 by
RouteU.S. Route 1
CountyRockingham County
StateNew Hampshire
Coordinates42.93184, -70.84254
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 rating72.5 US tons
Inventory rating43.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length49 ft (14.9 m)
Longest span47 ft (14.3 m)
Deck width43 ft (13 m)
Roadway width35 ft (10.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,581 (2023)
Projected traffic17,139 by 2043
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesPedestrian / bicycle
Detour if closed3.7 mi (6 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 statusEligible 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 US 1 SB over Nhrr(abd) built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1994.

What condition is US 1 SB 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 SB over Nhrr(abd) carry?

About 11,581 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is US 1 SB over Nhrr(abd)?

The structure is 49 ft (14.9 m) long with a longest span of 47 ft (14.3 m) and a deck 43 ft wide.

Who owns US 1 SB over Nhrr(abd)?

It is owned by the State Highway Agency.