US Bridges

US302 Nh 10 over I-93

Good

Grafton County, New Hampshire · 2.4 MI Bethlehem Tl · Structure no. 015301870006500

Built
1960
65 years old, rebuilt 1989
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
256 ft
5 main spans
Daily traffic
15,172
2023 count
Owner
State
State Highway Agency

About this bridge

US302 Nh 10 over I-93 is a steel continuous stringer/multi-beam or girder carrying US302 Nh 10 over I-93 in Grafton County, New Hampshire. It was built in 1960 and reconstructed in 1989, so it is 65 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 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 15,172 vehicles a day, roughly 7% of them trucks, projected to reach 22,454 by 2043. The structure is 256 ft (78 m) long and 73 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesUS302 Nh 10
CrossesI-93
Location2.4 MI Bethlehem Tl
RouteU.S. Route 302
CountyGrafton County
StateNew Hampshire
Coordinates44.30828, -71.79851
Functional classRural Minor Arterial

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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.6 US tons
Inventory rating52 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 25 or greater
Structure length256 ft (78 m)
Longest span65 ft (19.8 m)
Deck width73 ft (22.1 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,172 (2023)
Projected traffic22,454 by 2043
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo
Strategic Highway NetworkNon-Interstate 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 US302 Nh 10 over I-93 built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1989.

What condition is US302 Nh 10 over I-93 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 US302 Nh 10 over I-93 carry?

About 15,172 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US302 Nh 10 over I-93?

The structure is 256 ft (78 m) long with a longest span of 65 ft (19.8 m) and a deck 73 ft wide.

Who owns US302 Nh 10 over I-93?

It is owned by the State Highway Agency.