US Bridges

US302 over Avalanche Brook

Good

Carroll County, New Hampshire · 3.5 MI Carroll Tl · Structure no. 011601160008500

Built
1960
65 years old, rebuilt 2001
Condition
Good
inspected June 2024
Type
Frame
Concrete
Length
35 ft
1 main span
Daily traffic
3,004
2023 count
Owner
State
State Highway Agency

About this bridge

US302 over Avalanche Brook is a concrete frame carrying US302 over Avalanche Brook in Carroll County, New Hampshire. It was built in 1960 and reconstructed in 2001, so it is 65 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 3,004 vehicles a day, roughly 7% of them trucks, projected to reach 4,445 by 2043. The structure is 35 ft (10.7 m) long and 48 ft wide. If it were closed, the detour would be 47.8 mi (77 km).

Location

Open in Google Maps
CarriesUS302
CrossesAvalanche Brook
Location3.5 MI Carroll Tl
RouteU.S. Route 302
CountyCarroll County
StateNew Hampshire
Coordinates44.17028, -71.3845
Functional classRural Principal Arterial - Other

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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.5 US tons
Inventory rating49.5 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length35 ft (10.7 m)
Longest span30 ft (9.1 m)
Deck width48 ft (14.6 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,004 (2023)
Projected traffic4,445 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed47.8 mi (77 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)
NavigationNo navigation control on waterway

Frequently asked questions

When was US302 over Avalanche Brook built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2001.

What condition is US302 over Avalanche Brook 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 June 2024.

How much traffic does US302 over Avalanche Brook carry?

About 3,004 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US302 over Avalanche Brook?

The structure is 35 ft (10.7 m) long with a longest span of 30 ft (9.1 m) and a deck 48 ft wide.

Who owns US302 over Avalanche Brook?

It is owned by the State Highway Agency.