US Bridges

Old NH110 over Upper Ammonoosuc River

Good

Coos County, New Hampshire · 0.22 Mi. Stark Tl · Structure no. 006700420004300

Built
2020
5 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
85 ft
1 main span
Daily traffic
165
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Old NH110 over Upper Ammonoosuc River is a steel stringer/multi-beam or girder carrying Old NH110 over Upper Ammonoosuc River in Coos County, New Hampshire. It was built in 2020, so it is 5 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 165 vehicles a day, roughly 4% of them trucks, projected to reach 244 by 2043. The structure is 85 ft (25.8 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesOld NH110
CrossesUpper Ammonoosuc River
Location0.22 Mi. Stark Tl
CountyCoos County
StateNew Hampshire
Coordinates44.60912, -71.31468
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 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 alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length85 ft (25.8 m)
Longest span80 ft (24.4 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic165 (2023)
Projected traffic244 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Old NH110 over Upper Ammonoosuc River built?

It was built in 2020, making it 5 years old in 2025.

What condition is Old NH110 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 August 2024.

How much traffic does Old NH110 over Upper Ammonoosuc River carry?

About 165 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Old NH110 over Upper Ammonoosuc River?

The structure is 85 ft (25.8 m) long with a longest span of 80 ft (24.4 m) and a deck 28 ft wide.

Who owns Old NH110 over Upper Ammonoosuc River?

It is owned by the City or Municipal Highway Agency.