US Bridges

Gunn Mountain Road over Ashuelot River

GoodPosted for load

Cheshire County, New Hampshire · 0.02MI NH119 · Structure no. 027900820008700

Built
1864
161 years old, rebuilt 1999
Condition
Good
inspected August 2024
Type
Truss - Thru
Wood or Timber
Length
173 ft
2 main spans
Daily traffic
821
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Gunn Mountain Road over Ashuelot River is a wood or timber truss - thru carrying Gunn Mountain Road over Ashuelot River in Cheshire County, New Hampshire. It was built in 1864 and reconstructed in 1999, so it is 161 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. Its operating status is: posted for load restriction.

It carries about 821 vehicles a day, roughly 4% of them trucks, projected to reach 1,215 by 2043. The structure is 173 ft (52.8 m) long and 27 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesGunn Mountain Road
CrossesAshuelot River
Location0.02MI NH119
CountyCheshire County
StateNew Hampshire
Coordinates42.77716, -72.42333
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment2: Basically intolerable, requiring high priority of replacement
Operating rating11 US tons
Inventory rating7.1 US tons

Structure

Structure typeTruss - Thru
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadUnknown
Structure length173 ft (52.8 m)
Longest span84 ft (25.7 m)
Deck width27 ft (8.1 m)
Roadway width12 ft (3.6 m)
Vertical clearance over deck10 ft (3 m)

Traffic and service

Average daily traffic821 (2023)
Projected traffic1,215 by 2043
Trucks4%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusEligible 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 Gunn Mountain Road over Ashuelot River built?

It was built in 1864, making it 161 years old in 2025. It was reconstructed in 1999.

What condition is Gunn Mountain Road 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 August 2024.

How much traffic does Gunn Mountain Road over Ashuelot River carry?

About 821 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Gunn Mountain Road over Ashuelot River?

The structure is 173 ft (52.8 m) long with a longest span of 84 ft (25.7 m) and a deck 27 ft wide.

Who owns Gunn Mountain Road over Ashuelot River?

It is owned by the City or Municipal Highway Agency.