US Bridges

Emerson Road over Upper Ammonoosuc River

Good

Coos County, New Hampshire · 1.04 MI FR Northumberlan · Structure no. 024000790003200

Built
1982
43 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
125 ft
1 main span
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Emerson Road over Upper Ammonoosuc River is a steel stringer/multi-beam or girder carrying Emerson Road over Upper 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, roughly 4% of them trucks, projected to reach 142 by 2043. The structure is 125 ft (38.1 m) long and 31 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesEmerson Road
CrossesUpper Ammonoosuc River
Location1.04 MI FR Northumberlan
Coordinates44.62529, -71.46965
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 inspectionSeptember 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 rating73 US tons
Inventory rating46 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length125 ft (38.1 m)
Longest span120 ft (36.6 m)
Deck width31 ft (9.3 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96 (2023)
Projected traffic142 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Emerson Road over Upper Ammonoosuc River built?

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

What condition is Emerson Road over Upper 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 September 2024.

How much traffic does Emerson Road over Upper Ammonoosuc River carry?

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

How long is Emerson Road over Upper Ammonoosuc River?

The structure is 125 ft (38.1 m) long with a longest span of 120 ft (36.6 m) and a deck 31 ft wide.

Who owns Emerson Road over Upper Ammonoosuc River?

It is owned by the City or Municipal Highway Agency.