US Bridges

I-93 SB over Connecticut River

Good

Grafton County, New Hampshire · Vermont State Line · Structure no. 015301040013600

Built
1981
44 years old, rebuilt 2014
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
672 ft
4 main spans
Daily traffic
3,544
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 SB over Connecticut River is a steel continuous stringer/multi-beam or girder carrying I-93 SB over Connecticut River in Grafton County, New Hampshire. It was built in 1981 and reconstructed in 2014, so it is 44 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,544 vehicles a day, roughly 9% of them trucks, projected to reach 5,245 by 2043. The structure is 672 ft (204.8 m) long and 45 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesI-93 SB
CrossesConnecticut River
LocationVermont State Line
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates44.34291, -71.89113
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.2 US tons
Inventory rating35.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length672 ft (204.8 m)
Longest span184 ft (56.1 m)
Deck width45 ft (13.7 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,544 (2023)
Projected traffic5,245 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-93 SB over Connecticut River built?

It was built in 1981, making it 44 years old in 2025. It was reconstructed in 2014.

What condition is I-93 SB 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 September 2024.

How much traffic does I-93 SB over Connecticut River carry?

About 3,544 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 SB over Connecticut River?

The structure is 672 ft (204.8 m) long with a longest span of 184 ft (56.1 m) and a deck 45 ft wide.

Who owns I-93 SB over Connecticut River?

It is owned by the State Highway Agency.