US Bridges

US 4 over NH155A

Poor

Strafford County, New Hampshire · .5 Mi. from Lee T.L. · Structure no. 007000740013000

Built
1968
57 years old, rebuilt 2014
Condition
Poor
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
83 ft
1 main span
Daily traffic
13,387
2023 count
Owner
State
State Highway Agency

About this bridge

US 4 over NH155A is a steel stringer/multi-beam or girder carrying US 4 over NH155A in Strafford County, New Hampshire. It was built in 1968 and reconstructed in 2014, so it is 57 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 4 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 13,387 vehicles a day, roughly 7% of them trucks, projected to reach 19,812 by 2043. The structure is 83 ft (25.3 m) long and 50 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS 4
CrossesNH155A
Location.5 Mi. from Lee T.L.
RouteU.S. Route 4
CountyStrafford County
StateNew Hampshire
Coordinates43.1453, -70.95621
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.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 8 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.6 US tons
Inventory rating50.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length83 ft (25.3 m)
Longest span78 ft (23.8 m)
Deck width50 ft (15.2 m)
Roadway width45 ft (13.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,387 (2023)
Projected traffic19,812 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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 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 4 over NH155A built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2014.

What condition is US 4 over NH155A 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 December 2024.

How much traffic does US 4 over NH155A carry?

About 13,387 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 4 over NH155A?

The structure is 83 ft (25.3 m) long with a longest span of 78 ft (23.8 m) and a deck 50 ft wide.

Who owns US 4 over NH155A?

It is owned by the State Highway Agency.