US Bridges

US 3 Nh 25 over Squam River

Good

Grafton County, New Hampshire · 4.0 MI FR Center Harbor T · Structure no. 012601400008800

Built
1976
49 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
44 ft
1 main span
Daily traffic
3,490
2023 count
Owner
State
State Highway Agency

About this bridge

US 3 Nh 25 over Squam River is a steel stringer/multi-beam or girder carrying US 3 Nh 25 over Squam River in Grafton County, New Hampshire. It was built in 1976, so it is 49 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 3,490 vehicles a day, roughly 4% of them trucks, projected to reach 5,165 by 2043. The structure is 44 ft (13.4 m) long and 57 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesUS 3 Nh 25
CrossesSquam River
Location4.0 MI FR Center Harbor T
RouteU.S. Route 3
Coordinates43.73117, -71.58682
Functional classUrban Collector

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 inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating36 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span36 ft (11 m)
Deck width57 ft (17.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,490 (2023)
Projected traffic5,165 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.1 mi (13 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 US 3 Nh 25 over Squam River built?

It was built in 1976, making it 49 years old in 2025.

What condition is US 3 Nh 25 over Squam River 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 April 2024.

How much traffic does US 3 Nh 25 over Squam River carry?

About 3,490 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is US 3 Nh 25 over Squam River?

The structure is 44 ft (13.4 m) long with a longest span of 36 ft (11 m) and a deck 57 ft wide.

Who owns US 3 Nh 25 over Squam River?

It is owned by the State Highway Agency.