US Bridges

Nh 25 over Connecticut River

Fair

Grafton County, New Hampshire · Vermont State Line · Structure no. 020900320010300

Built
1929
96 years old, rebuilt 1993
Condition
Fair
inspected June 2024
Type
Truss - Thru
Steel
Length
355 ft
1 main span
Daily traffic
2,403
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 25 over Connecticut River is a steel truss - thru carrying Nh 25 over Connecticut River in Grafton County, New Hampshire. It was built in 1929 and reconstructed in 1993, so it is 96 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 2,403 vehicles a day, roughly 4% of them trucks, projected to reach 3,556 by 2043. The structure is 355 ft (108.2 m) long and 22 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesNh 25
CrossesConnecticut River
LocationVermont State Line
RouteState Highway 25
CountyGrafton County
StateNew Hampshire
Coordinates43.97809, -72.11204
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
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 alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating56 US tons
Inventory rating33.5 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckClosed grating
Main spans1
Design loadH 15
Structure length355 ft (108.2 m)
Longest span329 ft (100.3 m)
Deck width22 ft (6.6 m)
Roadway width21 ft (6.3 m)
Vertical clearance over deck16 ft (4.8 m)

Traffic and service

Average daily traffic2,403 (2023)
Projected traffic3,556 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 25 over Connecticut River built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1993.

What condition is Nh 25 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 25 over Connecticut River carry?

About 2,403 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Nh 25 over Connecticut River?

The structure is 355 ft (108.2 m) long with a longest span of 329 ft (100.3 m) and a deck 22 ft wide.

Who owns Nh 25 over Connecticut River?

It is owned by the State Highway Agency.