US Bridges

Durand Road over Carlton Brook

Fair

Coos County, New Hampshire · 0.2 MI from US RTE2 · Structure no. 021801400006700

Built
2010
15 years old
Condition
Fair
inspected August 2024
Type
Frame
Concrete
Length
22 ft
1 main span
Daily traffic
210
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Durand Road over Carlton Brook is a concrete frame carrying Durand Road over Carlton Brook in Coos County, New Hampshire. It was built in 2010, so it is 15 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 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 210 vehicles a day, roughly 4% of them trucks, projected to reach 310 by 2043. The structure is 22 ft (6.6 m) long and 30 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesDurand Road
CrossesCarlton Brook
Location0.2 MI from US RTE2
CountyCoos County
StateNew Hampshire
Coordinates44.37521, -71.27889
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating60.3 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length22 ft (6.6 m)
Longest span20 ft (6.1 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic210 (2023)
Projected traffic310 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Durand Road over Carlton Brook built?

It was built in 2010, making it 15 years old in 2025.

What condition is Durand Road over Carlton 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 August 2024.

How much traffic does Durand Road over Carlton Brook carry?

About 210 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Durand Road over Carlton Brook?

The structure is 22 ft (6.6 m) long with a longest span of 20 ft (6.1 m) and a deck 30 ft wide.

Who owns Durand Road over Carlton Brook?

It is owned by the City or Municipal Highway Agency.