US Bridges

New Hebron Road over Clay Brook

Good

Grafton County, New Hampshire · 0.3 MI from Texas Rd. · Structure no. 021601090010900

Built
2002
23 years old
Condition
Good
inspected July 2024
Type
Culvert
Concrete
Length
20 ft
1 main span
Daily traffic
180
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

New Hebron Road over Clay Brook is a concrete culvert carrying New Hebron Road over Clay Brook in Grafton County, New Hampshire. It was built in 2002, so it is 23 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 180 vehicles a day, roughly 4% of them trucks, projected to reach 266 by 2043. The structure is 20 ft (6.1 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesNew Hebron Road
CrossesClay Brook
Location0.3 MI from Texas Rd.
CountyGrafton County
StateNew Hampshire
Coordinates43.74525, -71.71958
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating63.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 25 or greater
Structure length20 ft (6.1 m)
Longest span20 ft (6.1 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180 (2023)
Projected traffic266 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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)
NavigationNo navigation control on waterway

Frequently asked questions

When was New Hebron Road over Clay Brook built?

It was built in 2002, making it 23 years old in 2025.

What condition is New Hebron Road over Clay 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 July 2024.

How much traffic does New Hebron Road over Clay Brook carry?

About 180 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is New Hebron Road over Clay Brook?

The structure is 20 ft (6.1 m) long with a longest span of 20 ft (6.1 m) and a deck 27 ft wide.

Who owns New Hebron Road over Clay Brook?

It is owned by the City or Municipal Highway Agency.