US Bridges

I-93 SB over NH135

Good

Grafton County, New Hampshire · 1.4MI. Vt Line · Structure no. 015301040013200

Built
1982
43 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
94 ft
1 main span
Daily traffic
3,544
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 SB over NH135 is a steel stringer/multi-beam or girder carrying I-93 SB over NH135 in Grafton County, New Hampshire. It was built in 1982, so it is 43 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 94 ft (28.7 m) long and 45 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesI-93 SB
CrossesNH135
Location1.4MI. Vt Line
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates44.34011, -71.89004
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.4 US tons
Inventory rating38.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length94 ft (28.7 m)
Longest span89 ft (27.1 m)
Deck width45 ft (13.6 m)
Roadway width40 ft (12.3 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
CrossesHighway
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)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-93 SB over NH135 built?

It was built in 1982, making it 43 years old in 2025.

What condition is I-93 SB over NH135 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 April 2023.

How much traffic does I-93 SB over NH135 carry?

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

How long is I-93 SB over NH135?

The structure is 94 ft (28.7 m) long with a longest span of 89 ft (27.1 m) and a deck 45 ft wide.

Who owns I-93 SB over NH135?

It is owned by the State Highway Agency.