US Bridges

Nh 25 over Oliverian Brook

Poor

Grafton County, New Hampshire · 1.0 MI Haverhill T.L. · Structure no. 002200580005200

Built
1960
65 years old
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
54 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 1960, so it is 65 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 1,072 vehicles a day, roughly 4% of them trucks, projected to reach 1,586 by 2043. The structure is 54 ft (16.5 m) long and 44 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesNh 25
CrossesOliverian Brook
Location1.0 MI Haverhill T.L.
RouteState Highway 25
CountyGrafton County
StateNew Hampshire
Coordinates44.00991, -71.93912
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 8 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.1 US tons
Inventory rating21.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length54 ft (16.5 m)
Longest span50 ft (15.2 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,072 (2023)
Projected traffic1,586 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 1960, making it 65 years old in 2025.

What condition is Nh 25 over Oliverian Brook in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does Nh 25 over Oliverian Brook carry?

About 1,072 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Nh 25 over Oliverian Brook?

The structure is 54 ft (16.5 m) long with a longest span of 50 ft (15.2 m) and a deck 44 ft wide.

Who owns Nh 25 over Oliverian Brook?

It is owned by the State Highway Agency.