US Bridges

Nh 9 over Island Pond Outlet

Fair

Cheshire County, New Hampshire · 2.2 Mi. W. Antrim Tl · Structure no. 024201540008200

Built
1964
61 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
20 ft
1 main span
Daily traffic
7,040
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 9 over Island Pond Outlet is a concrete culvert carrying Nh 9 over Island Pond Outlet in Cheshire County, New Hampshire. It was built in 1964, 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 fair condition with a lowest component rating of 6 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 7,040 vehicles a day, roughly 7% of them trucks, projected to reach 10,419 by 2043. The structure is 20 ft (6.1 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesNh 9
CrossesIsland Pond Outlet
Location2.2 Mi. W. Antrim Tl
RouteState Highway 9
CountyCheshire County
StateNew Hampshire
Coordinates43.05938, -72.0758
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length20 ft (6.1 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,040 (2023)
Projected traffic10,419 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Nh 9 over Island Pond Outlet built?

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

What condition is Nh 9 over Island Pond Outlet 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 2023.

How much traffic does Nh 9 over Island Pond Outlet carry?

About 7,040 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 9 over Island Pond Outlet?

The structure is 20 ft (6.1 m) long with a longest span of 20 ft (6.1 m).

Who owns Nh 9 over Island Pond Outlet?

It is owned by the State Highway Agency.