US Bridges

US 4 over Nhrr(abd)

Good

Merrimack County, New Hampshire · 3.7 MI from Wilmot Tl · Structure no. 005801560010300

Built
2023
2 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
75 ft
1 main span
Daily traffic
2,503
2023 count
Owner
State
State Highway Agency

About this bridge

US 4 over Nhrr(abd) is a concrete stringer/multi-beam or girder carrying US 4 over Nhrr(abd) in Merrimack County, New Hampshire. It was built in 2023, so it is 2 years old, younger than the New Hampshire average of 56.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,503 vehicles a day, projected to reach 3,704 by 2043. The structure is 75 ft (22.9 m) long and 38 ft wide.

Location

Open in Google Maps
CarriesUS 4
CrossesNhrr(abd)
Location3.7 MI from Wilmot Tl
RouteU.S. Route 4
CountyMerrimack County
StateNew Hampshire
Coordinates43.51948, -71.86418
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation9: Superior to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating64.6 US tons
Inventory rating49.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, precast panels
Main spans1 (+1 approach)
Design loadHL 93
Structure length75 ft (22.9 m)
Longest span60 ft (18.3 m)
Deck width38 ft (11.6 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic2,503 (2023)
Projected traffic3,704 by 2043
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesPedestrian / bicycle
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible 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 4 over Nhrr(abd) built?

It was built in 2023, making it 2 years old in 2025.

What condition is US 4 over Nhrr(abd) in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

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

About 2,503 vehicles per day (2023 count).

How long is US 4 over Nhrr(abd)?

The structure is 75 ft (22.9 m) long with a longest span of 60 ft (18.3 m) and a deck 38 ft wide.

Who owns US 4 over Nhrr(abd)?

It is owned by the State Highway Agency.