US Bridges

Nh 12 over S Br Ashuelot River

Fair

Cheshire County, New Hampshire · 0.7MI Swanzey T.L. · Structure no. 016300720007500

Built
1962
63 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
67 ft
1 main span
Daily traffic
8,976
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 12 over S Br Ashuelot River is a steel stringer/multi-beam or girder carrying Nh 12 over S Br Ashuelot River in Cheshire County, New Hampshire. It was built in 1962, so it is 63 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 8,976 vehicles a day, roughly 7% of them trucks, projected to reach 13,284 by 2043. The structure is 67 ft (20.4 m) long and 48 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesNh 12
CrossesS Br Ashuelot River
Location0.7MI Swanzey T.L.
RouteState Highway 12
CountyCheshire County
StateNew Hampshire
Coordinates42.86855, -72.20941
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length67 ft (20.4 m)
Longest span62 ft (18.9 m)
Deck width48 ft (14.5 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,976 (2023)
Projected traffic13,284 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 Br Ashuelot River built?

It was built in 1962, making it 63 years old in 2025.

What condition is Nh 12 over S Br Ashuelot River 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 May 2023.

How much traffic does Nh 12 over S Br Ashuelot River carry?

About 8,976 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 12 over S Br Ashuelot River?

The structure is 67 ft (20.4 m) long with a longest span of 62 ft (18.9 m) and a deck 48 ft wide.

Who owns Nh 12 over S Br Ashuelot River?

It is owned by the State Highway Agency.