US Bridges

NH135 over Ammonoosuc River

Fair

Grafton County, New Hampshire · Bath and Haverhill Tl · Structure no. 001800710006300

Built
1998
27 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
471 ft
3 main spans
Daily traffic
1,409
2023 count
Owner
State
State Highway Agency

About this bridge

NH135 over Ammonoosuc River is a steel continuous stringer/multi-beam or girder carrying NH135 over Ammonoosuc River in Grafton County, New Hampshire. It was built in 1998, so it is 27 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 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 1,409 vehicles a day, roughly 8% of them trucks, projected to reach 2,085 by 2043. The structure is 471 ft (143.5 m) long and 40 ft wide.

Location

Open in Google Maps
CarriesNH135
CrossesAmmonoosuc River
LocationBath and Haverhill Tl
RouteState Highway 135
CountyGrafton County
StateNew Hampshire
Coordinates44.15444, -72.03706
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95.2 US tons
Inventory rating57.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length471 ft (143.5 m)
Longest span185 ft (56.4 m)
Deck width40 ft (12.2 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,409 (2023)
Projected traffic2,085 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible 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 NH135 over Ammonoosuc River built?

It was built in 1998, making it 27 years old in 2025.

What condition is NH135 over Ammonoosuc 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 June 2024.

How much traffic does NH135 over Ammonoosuc River carry?

About 1,409 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is NH135 over Ammonoosuc River?

The structure is 471 ft (143.5 m) long with a longest span of 185 ft (56.4 m) and a deck 40 ft wide.

Who owns NH135 over Ammonoosuc River?

It is owned by the State Highway Agency.