US Bridges

US 4 over Connecticut River

Good

Grafton County, New Hampshire · 0.1 MI from Vermont Sl · Structure no. 014400580012800

Built
2015
10 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
452 ft
3 main spans
Daily traffic
11,594
2023 count
Owner
State
State Highway Agency

About this bridge

US 4 over Connecticut River is a steel continuous stringer/multi-beam or girder carrying US 4 over Connecticut River in Grafton County, New Hampshire. It was built in 2015, so it is 10 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 11,594 vehicles a day, roughly 5% of them trucks, projected to reach 17,159 by 2043. The structure is 452 ft (137.7 m) long and 48 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesUS 4
CrossesConnecticut River
Location0.1 MI from Vermont Sl
RouteU.S. Route 4
CountyGrafton County
StateNew Hampshire
Coordinates43.65067, -72.31466
Functional classUrban Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.6 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length452 ft (137.7 m)
Longest span178 ft (54.3 m)
Deck width48 ft (14.6 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic11,594 (2023)
Projected traffic17,159 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 km)
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)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 4 over Connecticut River built?

It was built in 2015, making it 10 years old in 2025.

What condition is US 4 over Connecticut River 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 June 2023.

How much traffic does US 4 over Connecticut River carry?

About 11,594 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is US 4 over Connecticut River?

The structure is 452 ft (137.7 m) long with a longest span of 178 ft (54.3 m) and a deck 48 ft wide.

Who owns US 4 over Connecticut River?

It is owned by the State Highway Agency.