US Bridges

US 4 over Nhrr(abd)

Fair

Merrimack County, New Hampshire · 0.075 MI W.Of Rte. 11 · Structure no. 000801180009500

Built
1959
66 years old, rebuilt 1994
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
130 ft
3 main spans
Daily traffic
2,172
2023 count
Owner
State
State Highway Agency

About this bridge

US 4 over Nhrr(abd) is a steel continuous stringer/multi-beam or girder carrying US 4 over Nhrr(abd) in Merrimack County, New Hampshire. It was built in 1959 and reconstructed in 1994, so it is 66 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 2,172 vehicles a day, roughly 4% of them trucks, projected to reach 3,214 by 2043. The structure is 130 ft (39.7 m) long and 46 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesUS 4
CrossesNhrr(abd)
Location0.075 MI W.Of Rte. 11
RouteU.S. Route 4
CountyMerrimack County
StateNew Hampshire
Coordinates43.43479, -71.80375
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.8 US tons
Inventory rating46.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length130 ft (39.7 m)
Longest span48 ft (14.6 m)
Deck width46 ft (14.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,172 (2023)
Projected traffic3,214 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemNo

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 Nhrr(abd) built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1994.

What condition is US 4 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 2024.

How much traffic does US 4 over Nhrr(abd) carry?

About 2,172 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is US 4 over Nhrr(abd)?

The structure is 130 ft (39.7 m) long with a longest span of 48 ft (14.6 m) and a deck 46 ft wide.

Who owns US 4 over Nhrr(abd)?

It is owned by the State Highway Agency.