US Bridges

US302 Nh 18 NH116 over I-93

Fair

Grafton County, New Hampshire · 2.1 MI Sugarhill Tl · Structure no. 002401110006400

Built
1959
66 years old, rebuilt 1988
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
288 ft
5 main spans
Daily traffic
3,454
2023 count
Owner
State
State Highway Agency

About this bridge

US302 Nh 18 NH116 over I-93 is a steel stringer/multi-beam or girder carrying US302 Nh 18 NH116 over I-93 in Grafton County, New Hampshire. It was built in 1959 and reconstructed in 1988, 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 3,454 vehicles a day, roughly 7% of them trucks, projected to reach 5,111 by 2043. The structure is 288 ft (87.8 m) long and 51 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS302 Nh 18 NH116
CrossesI-93
Location2.1 MI Sugarhill Tl
RouteU.S. Route 302
CountyGrafton County
StateNew Hampshire
Coordinates44.28446, -71.74426
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 rating87 US tons
Inventory rating52 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 25 or greater
Structure length288 ft (87.8 m)
Longest span74 ft (22.6 m)
Deck width51 ft (15.5 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,454 (2023)
Projected traffic5,111 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 US302 Nh 18 NH116 over I-93 built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1988.

What condition is US302 Nh 18 NH116 over I-93 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 US302 Nh 18 NH116 over I-93 carry?

About 3,454 vehicles per day (2023 count), of which roughly 7% are trucks.

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

The structure is 288 ft (87.8 m) long with a longest span of 74 ft (22.6 m) and a deck 51 ft wide.

Who owns US302 Nh 18 NH116 over I-93?

It is owned by the State Highway Agency.