US Bridges

I-93 NB over Coal Hill RD Gale River

Fair

Grafton County, New Hampshire · 1.9MI Sugarhill Tl · Structure no. 008700780011600

Built
1973
52 years old, rebuilt 1991
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
191 ft
3 main spans
Daily traffic
2,612
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 NB over Coal Hill RD Gale River is a steel continuous stringer/multi-beam or girder carrying I-93 NB over Coal Hill RD Gale River in Grafton County, New Hampshire. It was built in 1973 and reconstructed in 1991, so it is 52 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 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 2,612 vehicles a day, roughly 9% of them trucks, projected to reach 3,865 by 2043. The structure is 191 ft (58.2 m) long and 66 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-93 NB
CrossesCoal Hill RD Gale River
Location1.9MI Sugarhill Tl
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates44.21839, -71.72876
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length191 ft (58.2 m)
Longest span69 ft (21 m)
Deck width66 ft (20 m)
Roadway width64 ft (19.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,612 (2023)
Projected traffic3,865 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
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 NB over Coal Hill RD Gale River built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 1991.

What condition is I-93 NB over Coal Hill RD Gale River 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 August 2023.

How much traffic does I-93 NB over Coal Hill RD Gale River carry?

About 2,612 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 NB over Coal Hill RD Gale River?

The structure is 191 ft (58.2 m) long with a longest span of 69 ft (21 m) and a deck 66 ft wide.

Who owns I-93 NB over Coal Hill RD Gale River?

It is owned by the State Highway Agency.