US Bridges

NH106 over US 3 Nh 11

Good

Belknap County, New Hampshire · .4 MI Belmont Tl · Structure no. 013901320002700

Built
1964
61 years old, rebuilt 2019
Condition
Good
inspected November 2024
Type
Frame
Concrete
Length
61 ft
1 main span
Daily traffic
11,620
2023 count
Owner
State
State Highway Agency

About this bridge

NH106 over US 3 Nh 11 is a concrete frame carrying NH106 over US 3 Nh 11 in Belknap County, New Hampshire. It was built in 1964 and reconstructed in 2019, so it is 61 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 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 11,620 vehicles a day, roughly 5% of them trucks, projected to reach 17,197 by 2043. The structure is 61 ft (18.6 m) long and 66 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesNH106
CrossesUS 3 Nh 11
Location.4 MI Belmont Tl
RouteState Highway 106
Coordinates43.51224, -71.45893
Functional classUrban Other Principal Arterial

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.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating36 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length61 ft (18.6 m)
Longest span53 ft (16.2 m)
Deck width66 ft (20.1 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,620 (2023)
Projected traffic17,197 by 2043
Trucks5%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemYes

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)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NH106 over US 3 Nh 11 built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2019.

What condition is NH106 over US 3 Nh 11 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 November 2024.

How much traffic does NH106 over US 3 Nh 11 carry?

About 11,620 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is NH106 over US 3 Nh 11?

The structure is 61 ft (18.6 m) long with a longest span of 53 ft (16.2 m) and a deck 66 ft wide.

Who owns NH106 over US 3 Nh 11?

It is owned by the State Highway Agency.