US Bridges

US 3 over Hubbard Brook

Good

Grafton County, New Hampshire · 5.3 Mi. from Campton Tl · Structure no. 025401540007500

Built
1971
54 years old
Condition
Good
inspected April 2024
Type
Frame
Concrete Continuous
Length
51 ft
2 main spans
Daily traffic
1,291
2023 count
Owner
State
State Highway Agency

About this bridge

US 3 over Hubbard Brook is a concrete continuous frame carrying US 3 over Hubbard Brook in Grafton County, New Hampshire. It was built in 1971, so it is 54 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 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 1,291 vehicles a day, roughly 4% of them trucks, projected to reach 1,910 by 2043. The structure is 51 ft (15.5 m) long and 46 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesUS 3
CrossesHubbard Brook
Location5.3 Mi. from Campton Tl
RouteU.S. Route 3
CountyGrafton County
StateNew Hampshire
Coordinates43.93269, -71.68515
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating29 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span24 ft (7.3 m)
Deck width46 ft (14.1 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,291 (2023)
Projected traffic1,910 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$314,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 3 over Hubbard Brook built?

It was built in 1971, making it 54 years old in 2025.

What condition is US 3 over Hubbard Brook 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 2024.

How much traffic does US 3 over Hubbard Brook carry?

About 1,291 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is US 3 over Hubbard Brook?

The structure is 51 ft (15.5 m) long with a longest span of 24 ft (7.3 m) and a deck 46 ft wide.

Who owns US 3 over Hubbard Brook?

It is owned by the State Highway Agency.