US Bridges

I-93 SB over US302 Nh 10 Nh 18 NH116

Fair

Grafton County, New Hampshire · 0.03 MI Littleton Tl · Structure no. 002401000005000

Built
1959
66 years old, rebuilt 1991
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
78 ft
1 main span
Daily traffic
4,291
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 SB over US302 Nh 10 Nh 18 NH116 is a steel stringer/multi-beam or girder carrying I-93 SB over US302 Nh 10 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 4,291 vehicles a day, roughly 9% of them trucks, projected to reach 6,350 by 2043. The structure is 78 ft (23.8 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-93 SB
CrossesUS302 Nh 10 Nh 18 NH116
Location0.03 MI Littleton Tl
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates44.2935, -71.76007
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.6 US tons
Inventory rating39.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length78 ft (23.8 m)
Longest span70 ft (21.3 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,291 (2023)
Projected traffic6,350 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 US302 Nh 10 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 US302 Nh 10 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 June 2023.

How much traffic does I-93 SB over US302 Nh 10 Nh 18 NH116 carry?

About 4,291 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 SB over US302 Nh 10 Nh 18 NH116?

The structure is 78 ft (23.8 m) long with a longest span of 70 ft (21.3 m) and a deck 44 ft wide.

Who owns I-93 SB over US302 Nh 10 Nh 18 NH116?

It is owned by the State Highway Agency.