US Bridges

Jefferson Notch RD over Ammonoosuc River

Good

Coos County, New Hampshire · .4MIJCT 42 + 44 · Structure no. 005550960018800

Built
1982
43 years old
Condition
Good
inspected July 2024
Type
Frame
Concrete
Length
31 ft
1 main span
Daily traffic
96
2023 count
Owner
State
State Highway Agency

About this bridge

Jefferson Notch RD over Ammonoosuc River is a concrete frame carrying Jefferson Notch RD over Ammonoosuc River in Coos County, New Hampshire. It was built in 1982, so it is 43 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 96 vehicles a day, projected to reach 142 by 2043. The structure is 31 ft (9.4 m) long and 28 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

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CarriesJefferson Notch RD
CrossesAmmonoosuc River
Location.4MIJCT 42 + 44
RouteState Highway 0
CountyCoos County
StateNew Hampshire
Coordinates44.26741, -71.37737
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.9 US tons
Inventory rating45.4 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span23 ft (7 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96 (2023)
Projected traffic142 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

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 Jefferson Notch RD over Ammonoosuc River built?

It was built in 1982, making it 43 years old in 2025.

What condition is Jefferson Notch RD over Ammonoosuc 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 July 2024.

How much traffic does Jefferson Notch RD over Ammonoosuc River carry?

About 96 vehicles per day (2023 count).

How long is Jefferson Notch RD over Ammonoosuc River?

The structure is 31 ft (9.4 m) long with a longest span of 23 ft (7 m) and a deck 28 ft wide.

Who owns Jefferson Notch RD over Ammonoosuc River?

It is owned by the State Highway Agency.