US Bridges

Nh 11 Nh 12 over Little Sugar River

Fair

Sullivan County, New Hampshire · 2.2 Mi. from Claremont Tl · Structure no. 004200690009600

Built
1964
61 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete
Length
27 ft
1 main span
Daily traffic
7,934
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 11 Nh 12 over Little Sugar River is a concrete culvert carrying Nh 11 Nh 12 over Little Sugar River in Sullivan County, New Hampshire. It was built in 1964, so it is 61 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 7,934 vehicles a day, roughly 7% of them trucks, projected to reach 11,742 by 2043. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 1.9 mi (3 km).

CarriesNh 11 Nh 12
CrossesLittle Sugar River
Location2.2 Mi. from Claremont Tl
RouteState Highway 12
Coordinates43.30632, -72.38056
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadH 20
Structure length27 ft (8.2 m)
Longest span27 ft (8.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,934 (2023)
Projected traffic11,742 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Nh 11 Nh 12 over Little Sugar River built?

It was built in 1964, making it 61 years old in 2025.

What condition is Nh 11 Nh 12 over Little Sugar 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 April 2024.

How much traffic does Nh 11 Nh 12 over Little Sugar River carry?

About 7,934 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 11 Nh 12 over Little Sugar River?

The structure is 27 ft (8.2 m) long with a longest span of 27 ft (8.2 m).

Who owns Nh 11 Nh 12 over Little Sugar River?

It is owned by the State Highway Agency.