US Bridges

Coldbrook Road over Moose River

Fair

Coos County, New Hampshire · 0.4 MI from US RTE 2 · Structure no. 021801250006200

Built
1949
76 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
34 ft
1 main span
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Coldbrook Road over Moose River is a steel stringer/multi-beam or girder carrying Coldbrook Road over Moose River in Coos County, New Hampshire. It was built in 1949, so it is 76 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 96 vehicles a day, roughly 4% of them trucks, projected to reach 142 by 2043. The structure is 34 ft (10.4 m) long and 15 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesColdbrook Road
CrossesMoose River
Location0.4 MI from US RTE 2
CountyCoos County
StateNew Hampshire
Coordinates44.37334, -71.29647
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.3 US tons
Inventory rating22.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length34 ft (10.4 m)
Longest span30 ft (9.1 m)
Deck width15 ft (4.5 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96 (2023)
Projected traffic142 by 2043
Trucks4%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Coldbrook Road over Moose River built?

It was built in 1949, making it 76 years old in 2025.

What condition is Coldbrook Road over Moose 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 August 2023.

How much traffic does Coldbrook Road over Moose River carry?

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

How long is Coldbrook Road over Moose River?

The structure is 34 ft (10.4 m) long with a longest span of 30 ft (9.1 m) and a deck 15 ft wide.

Who owns Coldbrook Road over Moose River?

It is owned by the City or Municipal Highway Agency.