US Bridges

NH110 over North Branch Brook

Fair

Coos County, New Hampshire · 0.8 MI from Dummer Tl · Structure no. 017000830012800

Built
1954
71 years old, rebuilt 1995
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
1,693
2023 count
Owner
State
State Highway Agency

About this bridge

NH110 over North Branch Brook is a steel stringer/multi-beam or girder carrying NH110 over North Branch Brook in Coos County, New Hampshire. It was built in 1954 and reconstructed in 1995, so it is 71 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 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 1,693 vehicles a day, roughly 4% of them trucks, projected to reach 2,505 by 2043. The structure is 60 ft (18.3 m) long and 49 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesNH110
CrossesNorth Branch Brook
Location0.8 MI from Dummer Tl
RouteState Highway 110
CountyCoos County
StateNew Hampshire
Coordinates44.59465, -71.30126
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.6 US tons
Inventory rating53.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length60 ft (18.3 m)
Longest span54 ft (16.5 m)
Deck width49 ft (15 m)
Roadway width44 ft (13.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,693 (2023)
Projected traffic2,505 by 2043
Trucks4%
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 NH110 over North Branch Brook built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 1995.

What condition is NH110 over North Branch Brook 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 2023.

How much traffic does NH110 over North Branch Brook carry?

About 1,693 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH110 over North Branch Brook?

The structure is 60 ft (18.3 m) long with a longest span of 54 ft (16.5 m) and a deck 49 ft wide.

Who owns NH110 over North Branch Brook?

It is owned by the State Highway Agency.