US Bridges

Nh 9 over N Br Contoocook River

Good

Cheshire County, New Hampshire · 0.1 MI NE to Antrim T/L · Structure no. 024201830010600

Built
1999
26 years old
Condition
Good
inspected June 2023
Type
Frame
Concrete
Length
73 ft
1 main span
Daily traffic
7,112
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 9 over N Br Contoocook River is a concrete frame carrying Nh 9 over N Br Contoocook River in Cheshire County, New Hampshire. It was built in 1999, so it is 26 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 7,112 vehicles a day, roughly 7% of them trucks, projected to reach 10,525 by 2043. The structure is 73 ft (22.1 m) long and 35 ft wide. If it were closed, the detour would be 36 mi (58 km).

Location

Open in Google Maps
CarriesNh 9
CrossesN Br Contoocook River
Location0.1 MI NE to Antrim T/L
RouteState Highway 9
CountyCheshire County
StateNew Hampshire
Coordinates43.07437, -72.04561
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating77.9 US tons
Inventory rating46.8 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length73 ft (22.1 m)
Longest span64 ft (19.5 m)
Deck width35 ft (10.7 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,112 (2023)
Projected traffic10,525 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed36 mi (58 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for 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 9 over N Br Contoocook River built?

It was built in 1999, making it 26 years old in 2025.

What condition is Nh 9 over N Br Contoocook 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 June 2023.

How much traffic does Nh 9 over N Br Contoocook River carry?

About 7,112 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 9 over N Br Contoocook River?

The structure is 73 ft (22.1 m) long with a longest span of 64 ft (19.5 m) and a deck 35 ft wide.

Who owns Nh 9 over N Br Contoocook River?

It is owned by the State Highway Agency.