US Bridges

Nh 12 over S Branch Ashuelot River

Good

Cheshire County, New Hampshire · 1.6 MI S to Troy Center · Structure no. 025800870011600

Built
1941
84 years old, rebuilt 1997
Condition
Good
inspected June 2023
Type
Frame
Concrete
Length
36 ft
1 main span
Daily traffic
8,976
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 12 over S Branch Ashuelot River is a concrete frame carrying Nh 12 over S Branch Ashuelot River in Cheshire County, New Hampshire. It was built in 1941 and reconstructed in 1997, so it is 84 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 8,976 vehicles a day, roughly 9% of them trucks, projected to reach 13,284 by 2043. The structure is 36 ft (11 m) long and 35 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesNh 12
CrossesS Branch Ashuelot River
Location1.6 MI S to Troy Center
RouteState Highway 12
CountyCheshire County
StateNew Hampshire
Coordinates42.84696, -72.191
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 protection8 Very GoodNo 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.1 US tons
Inventory rating43.7 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length36 ft (11 m)
Longest span32 ft (9.8 m)
Deck width35 ft (10.7 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,976 (2023)
Projected traffic13,284 by 2043
Trucks9%
Lanes on structure11
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed9.9 mi (16 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 12 over S Branch Ashuelot River built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 1997.

What condition is Nh 12 over S Branch Ashuelot 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 12 over S Branch Ashuelot River carry?

About 8,976 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Nh 12 over S Branch Ashuelot River?

The structure is 36 ft (11 m) long with a longest span of 32 ft (9.8 m) and a deck 35 ft wide.

Who owns Nh 12 over S Branch Ashuelot River?

It is owned by the State Highway Agency.