US Bridges

Nh 25A over Jacobs Brook

Fair

Grafton County, New Hampshire · 4.1 MI from Vermont Sl · Structure no. 020301210009100

Built
1925
100 years old, rebuilt 1986
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
39 ft
1 main span
Daily traffic
1,116
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 25A over Jacobs Brook is a steel stringer/multi-beam or girder carrying Nh 25A over Jacobs Brook in Grafton County, New Hampshire. It was built in 1925 and reconstructed in 1986, so it is 100 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 1,116 vehicles a day, roughly 7% of them trucks, projected to reach 1,651 by 2043. The structure is 39 ft (11.9 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNh 25A
CrossesJacobs Brook
Location4.1 MI from Vermont Sl
RouteState Highway 25A
CountyGrafton County
StateNew Hampshire
Coordinates43.88491, -72.08156
Functional classRural Major 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
Deck7 GoodSome minor problems.
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 evaluation6: Equal to 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 alignment6: Equal to present minimum criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length39 ft (11.9 m)
Longest span36 ft (11 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,116 (2023)
Projected traffic1,651 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 25A over Jacobs Brook built?

It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1986.

What condition is Nh 25A over Jacobs 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 Nh 25A over Jacobs Brook carry?

About 1,116 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 25A over Jacobs Brook?

The structure is 39 ft (11.9 m) long with a longest span of 36 ft (11 m) and a deck 35 ft wide.

Who owns Nh 25A over Jacobs Brook?

It is owned by the State Highway Agency.