US Bridges

North Groton Road over Small Brook

Fair

Grafton County, New Hampshire · 2.4 MI from Hebron Tl · Structure no. 010501530008400

Built
1927
98 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
173
2023 count
Owner
State
State Highway Agency

About this bridge

North Groton Road over Small Brook is a concrete slab carrying North Groton Road over Small Brook in Grafton County, New Hampshire. It was built in 1927, so it is 98 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 173 vehicles a day, roughly 10% of them trucks, projected to reach 256 by 2043. The structure is 23 ft (7 m) long and 29 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesNorth Groton Road
CrossesSmall Brook
Location2.4 MI from Hebron Tl
RouteState Highway 0
CountyGrafton County
StateNew Hampshire
Coordinates43.71795, -71.83646
Functional classRural Minor Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating27 US tons
Inventory rating16 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length23 ft (7 m)
Longest span21 ft (6.4 m)
Deck width29 ft (8.8 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic173 (2023)
Projected traffic256 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 North Groton Road over Small Brook built?

It was built in 1927, making it 98 years old in 2025.

What condition is North Groton Road over Small Brook 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 April 2024.

How much traffic does North Groton Road over Small Brook carry?

About 173 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is North Groton Road over Small Brook?

The structure is 23 ft (7 m) long with a longest span of 21 ft (6.4 m) and a deck 29 ft wide.

Who owns North Groton Road over Small Brook?

It is owned by the State Highway Agency.