US Bridges

Nh 25A over Connecticut River

Fair

Grafton County, New Hampshire · Vermont State Line · Structure no. 020300620012400

Built
1937
88 years old, rebuilt 2002
Condition
Fair
inspected June 2024
Type
Arch - Thru
Steel
Length
434 ft
1 main span
Daily traffic
3,625
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 25A over Connecticut River is a steel arch - thru carrying Nh 25A over Connecticut River in Grafton County, New Hampshire. It was built in 1937 and reconstructed in 2002, so it is 88 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 5 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 3,625 vehicles a day, roughly 7% of them trucks, projected to reach 5,365 by 2043. The structure is 434 ft (132.2 m) long and 26 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesNh 25A
CrossesConnecticut River
LocationVermont State Line
RouteState Highway 25A
CountyGrafton County
StateNew Hampshire
Coordinates43.90717, -72.13951
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.7 US tons
Inventory rating25.9 US tons

Structure

Structure typeArch - Thru
MaterialSteel
DeckClosed grating
Main spans1
Design loadH 15
Structure length434 ft (132.2 m)
Longest span425 ft (129.5 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck14 ft (4.4 m)

Traffic and service

Average daily traffic3,625 (2023)
Projected traffic5,365 by 2043
Trucks7%
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 statusListed on 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 25A over Connecticut River built?

It was built in 1937, making it 88 years old in 2025. It was reconstructed in 2002.

What condition is Nh 25A over Connecticut River 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 June 2024.

How much traffic does Nh 25A over Connecticut River carry?

About 3,625 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 25A over Connecticut River?

The structure is 434 ft (132.2 m) long with a longest span of 425 ft (129.5 m) and a deck 26 ft wide.

Who owns Nh 25A over Connecticut River?

It is owned by the State Highway Agency.