US Bridges

Nh 9 Nh 10 over Ashuelot River

Good

Cheshire County, New Hampshire · 0.2 MI East of JCT Nh 12 · Structure no. 013601210009300

Built
1978
47 years old, rebuilt 2014
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
246 ft
3 main spans
Daily traffic
12,017
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 9 Nh 10 over Ashuelot River is a steel stringer/multi-beam or girder carrying Nh 9 Nh 10 over Ashuelot River in Cheshire County, New Hampshire. It was built in 1978 and reconstructed in 2014, 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 12,017 vehicles a day, roughly 5% of them trucks, projected to reach 17,785 by 2043. The structure is 246 ft (75 m) long and 65 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesNh 9 Nh 10
CrossesAshuelot River
Location0.2 MI East of JCT Nh 12
RouteState Highway 9
CountyCheshire County
StateNew Hampshire
Coordinates42.94569, -72.29201
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating61.6 US tons
Inventory rating36.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length246 ft (75 m)
Longest span104 ft (31.7 m)
Deck width65 ft (19.8 m)
Roadway width60 ft (18.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,017 (2023)
Projected traffic17,785 by 2043
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Nh 10 over Ashuelot River built?

It was built in 1978, making it 47 years old in 2025. It was reconstructed in 2014.

What condition is Nh 9 Nh 10 over 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 March 2023.

How much traffic does Nh 9 Nh 10 over Ashuelot River carry?

About 12,017 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Nh 9 Nh 10 over Ashuelot River?

The structure is 246 ft (75 m) long with a longest span of 104 ft (31.7 m) and a deck 65 ft wide.

Who owns Nh 9 Nh 10 over Ashuelot River?

It is owned by the State Highway Agency.