US Bridges

Nh 25 over Oliverian Brook

Good

Grafton County, New Hampshire · 1.4 MI from Benton Tl · Structure no. 011700720006100

Built
1999
26 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
72 ft
1 main span
Daily traffic
1,072
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 25 over Oliverian Brook is a steel stringer/multi-beam or girder carrying Nh 25 over Oliverian Brook in Grafton County, New Hampshire. It was built in 1999, so it is 26 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 1,072 vehicles a day, roughly 16% of them trucks, projected to reach 1,586 by 2043. The structure is 72 ft (21.8 m) long and 39 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

CarriesNh 25
CrossesOliverian Brook
Location1.4 MI from Benton Tl
RouteState Highway 25
Coordinates44.02859, -71.97951
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 protection7 GoodSome minor problems.
Last inspectionJune 2023
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating97 US tons
Inventory rating58.1 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length72 ft (21.8 m)
Longest span66 ft (20 m)
Deck width39 ft (11.9 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,072 (2023)
Projected traffic1,586 by 2043
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemNo

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)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nh 25 over Oliverian Brook built?

It was built in 1999, making it 26 years old in 2025.

What condition is Nh 25 over Oliverian 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 June 2023.

How much traffic does Nh 25 over Oliverian Brook carry?

About 1,072 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is Nh 25 over Oliverian Brook?

The structure is 72 ft (21.8 m) long with a longest span of 66 ft (20 m) and a deck 39 ft wide.

Who owns Nh 25 over Oliverian Brook?

It is owned by the State Highway Agency.