US Bridges

US 1 over Csx(abd)

Poor

Rockingham County, New Hampshire · 0.1 MI from N Hampton Tl · Structure no. 011101630018400

Built
1936
89 years old, rebuilt 1977
Condition
Poor
inspected November 2024
Type
Girder and Floorbeam System
Steel Continuous
Length
120 ft
1 main span
Daily traffic
14,314
2023 count
Owner
State
State Highway Agency

About this bridge

US 1 over Csx(abd) is a steel continuous girder and floorbeam system carrying US 1 over Csx(abd) in Rockingham County, New Hampshire. It was built in 1936 and reconstructed in 1977, 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 poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 14,314 vehicles a day, roughly 5% of them trucks, projected to reach 21,184 by 2043. The structure is 120 ft (36.6 m) long and 40 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS 1
CrossesCsx(abd)
Location0.1 MI from N Hampton Tl
RouteU.S. Route 1
CountyRockingham County
StateNew Hampshire
Coordinates42.95728, -70.83366
Functional classUrban Other Principal Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 8 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.7 US tons
Inventory rating25.6 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length120 ft (36.6 m)
Longest span108 ft (32.9 m)
Deck width40 ft (12.2 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,314 (2023)
Projected traffic21,184 by 2043
Trucks5%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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 over Csx(abd) built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1977.

What condition is US 1 over Csx(abd) in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does US 1 over Csx(abd) carry?

About 14,314 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is US 1 over Csx(abd)?

The structure is 120 ft (36.6 m) long with a longest span of 108 ft (32.9 m) and a deck 40 ft wide.

Who owns US 1 over Csx(abd)?

It is owned by the State Highway Agency.