US Bridges

Nh 25 over Oliverian Brook

Good

Grafton County, New Hampshire · 1.5 MI W Benton Tl · Structure no. 011700670009200

Built
1975
50 years old, rebuilt 2019
Condition
Good
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
85 ft
1 main span
Daily traffic
776
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 1975 and reconstructed in 2019, so it is 50 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 776 vehicles a day, roughly 4% of them trucks, projected to reach 1,148 by 2043. The structure is 85 ft (25.9 m) long and 40 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

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CarriesNh 25
CrossesOliverian Brook
Location1.5 MI W Benton Tl
RouteState Highway 25
CountyGrafton County
StateNew Hampshire
Coordinates44.03062, -72.00891
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 inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length85 ft (25.9 m)
Longest span71 ft (21.6 m)
Deck width40 ft (12.3 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic776 (2023)
Projected traffic1,148 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 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 Oliverian Brook built?

It was built in 1975, making it 50 years old in 2025. It was reconstructed in 2019.

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 March 2024.

How much traffic does Nh 25 over Oliverian Brook carry?

About 776 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Nh 25 over Oliverian Brook?

The structure is 85 ft (25.9 m) long with a longest span of 71 ft (21.6 m) and a deck 40 ft wide.

Who owns Nh 25 over Oliverian Brook?

It is owned by the State Highway Agency.