US Bridges

West Bath Road over Ammonoosuc R Nhrr(abd)

FairPosted for load

Grafton County, New Hampshire · 0.1 MI Nh 10 · Structure no. 001801370009500

Built
1832
193 years old, rebuilt 2014
Condition
Fair
inspected October 2024
Type
Truss - Thru
Wood or Timber
Length
375 ft
7 main spans
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

West Bath Road over Ammonoosuc R Nhrr(abd) is a wood or timber truss - thru carrying West Bath Road over Ammonoosuc R Nhrr(abd) in Grafton County, New Hampshire. It was built in 1832 and reconstructed in 2014, so it is 193 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 96 vehicles a day, roughly 4% of them trucks, projected to reach 142 by 2043. The structure is 375 ft (114.3 m) long and 20 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesWest Bath Road
CrossesAmmonoosuc R Nhrr(abd)
Location0.1 MI Nh 10
CountyGrafton County
StateNew Hampshire
Coordinates44.16685, -71.96722
Functional classRural Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating12.3 US tons
Inventory rating10.3 US tons

Structure

Structure typeTruss - Thru
MaterialWood or Timber
DeckWood or timber
Main spans7
Design loadUnknown
Structure length375 ft (114.3 m)
Longest span87 ft (26.5 m)
Deck width20 ft (6.2 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deck8 ft (2.5 m)

Traffic and service

Average daily traffic96 (2023)
Projected traffic142 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusListed on 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 West Bath Road over Ammonoosuc R Nhrr(abd) built?

It was built in 1832, making it 193 years old in 2025. It was reconstructed in 2014.

What condition is West Bath Road over Ammonoosuc R Nhrr(abd) 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 October 2024.

How much traffic does West Bath Road over Ammonoosuc R Nhrr(abd) carry?

About 96 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is West Bath Road over Ammonoosuc R Nhrr(abd)?

The structure is 375 ft (114.3 m) long with a longest span of 87 ft (26.5 m) and a deck 20 ft wide.

Who owns West Bath Road over Ammonoosuc R Nhrr(abd)?

It is owned by the City or Municipal Highway Agency.