US Bridges

Nh 25 over Groton Hollow Brook

Good

Grafton County, New Hampshire · 5.5 Wentworth T.L. · Structure no. 022501510005000

Built
1965
60 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
69 ft
1 main span
Daily traffic
6,717
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 25 over Groton Hollow Brook is a steel stringer/multi-beam or girder carrying Nh 25 over Groton Hollow Brook in Grafton County, New Hampshire. It was built in 1965, so it is 60 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 6,717 vehicles a day, roughly 7% of them trucks, projected to reach 9,941 by 2043. The structure is 69 ft (21 m) long and 47 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesNh 25
CrossesGroton Hollow Brook
Location5.5 Wentworth T.L.
RouteState Highway 25
CountyGrafton County
StateNew Hampshire
Coordinates43.78939, -71.7966
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.
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.1 US tons
Inventory rating30.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length69 ft (21 m)
Longest span64 ft (19.5 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,717 (2023)
Projected traffic9,941 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Nh 25 over Groton Hollow Brook built?

It was built in 1965, making it 60 years old in 2025.

What condition is Nh 25 over Groton Hollow 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 Nh 25 over Groton Hollow Brook carry?

About 6,717 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 25 over Groton Hollow Brook?

The structure is 69 ft (21 m) long with a longest span of 64 ft (19.5 m) and a deck 47 ft wide.

Who owns Nh 25 over Groton Hollow Brook?

It is owned by the State Highway Agency.