US Bridges

Nh 9 Nh 10 over Nh 12

Good

Cheshire County, New Hampshire · North JCT of Nh 9 10 &12 · Structure no. 013601150008900

Built
1978
47 years old, rebuilt 2015
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
157 ft
1 main span
Daily traffic
5,162
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 9 Nh 10 over Nh 12 is a steel stringer/multi-beam or girder carrying Nh 9 Nh 10 over Nh 12 in Cheshire County, New Hampshire. It was built in 1978 and reconstructed in 2015, so it is 47 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 5,162 vehicles a day, roughly 5% of them trucks, projected to reach 7,639 by 2043. The structure is 157 ft (47.9 m) long and 78 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNh 9 Nh 10
CrossesNh 12
LocationNorth JCT of Nh 9 10 &12
RouteState Highway 9
CountyCheshire County
StateNew Hampshire
Coordinates42.94417, -72.29563
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 inspectionMarch 2023
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 rating65.3 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length157 ft (47.9 m)
Longest span152 ft (46.3 m)
Deck width78 ft (23.8 m)
Roadway width63 ft (19.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,162 (2023)
Projected traffic7,639 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 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 Nh 9 Nh 10 over Nh 12 built?

It was built in 1978, making it 47 years old in 2025. It was reconstructed in 2015.

What condition is Nh 9 Nh 10 over Nh 12 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 March 2023.

How much traffic does Nh 9 Nh 10 over Nh 12 carry?

About 5,162 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Nh 9 Nh 10 over Nh 12?

The structure is 157 ft (47.9 m) long with a longest span of 152 ft (46.3 m) and a deck 78 ft wide.

Who owns Nh 9 Nh 10 over Nh 12?

It is owned by the State Highway Agency.