US Bridges

I-93 SB over Nh 18 NH116

Fair

Grafton County, New Hampshire · 0.3 MI Sugarhill Tl · Structure no. 002401470006000

Built
1959
66 years old, rebuilt 1991
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
65 ft
1 main span
Daily traffic
2,632
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 SB over Nh 18 NH116 is a steel stringer/multi-beam or girder carrying I-93 SB over Nh 18 NH116 in Grafton County, New Hampshire. It was built in 1959 and reconstructed in 1991, 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 2,632 vehicles a day, roughly 9% of them trucks, projected to reach 3,895 by 2043. The structure is 65 ft (19.8 m) long and 55 ft wide.

Location

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CarriesI-93 SB
CrossesNh 18 NH116
Location0.3 MI Sugarhill Tl
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates44.26031, -71.75214
Functional classRural Principal Arterial - Interstate

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 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating69 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length65 ft (19.8 m)
Longest span59 ft (18 m)
Deck width55 ft (16.7 m)
Roadway width53 ft (16.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,632 (2023)
Projected traffic3,895 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 Nh 18 NH116 built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1991.

What condition is I-93 SB over Nh 18 NH116 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 2023.

How much traffic does I-93 SB over Nh 18 NH116 carry?

About 2,632 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 SB over Nh 18 NH116?

The structure is 65 ft (19.8 m) long with a longest span of 59 ft (18 m) and a deck 55 ft wide.

Who owns I-93 SB over Nh 18 NH116?

It is owned by the State Highway Agency.