US Bridges

Nh 12A over Little Sugar River

Fair

Sullivan County, New Hampshire · 0.6 MI NW JCT 12 and 12A · Structure no. 004200700009200

Built
1984
41 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
36 ft
1 main span
Daily traffic
1,429
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 12A over Little Sugar River is a steel stringer/multi-beam or girder carrying Nh 12A over Little Sugar River in Sullivan County, New Hampshire. It was built in 1984, so it is 41 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 1,429 vehicles a day, roughly 4% of them trucks, projected to reach 2,114 by 2043. The structure is 36 ft (11 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesNh 12A
CrossesLittle Sugar River
Location0.6 MI NW JCT 12 and 12A
RouteState Highway 12A
CountySullivan County
StateNew Hampshire
Coordinates43.30576, -72.3864
Functional classRural Major Collector

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 protection6 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
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating71.7 US tons
Inventory rating43 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length36 ft (11 m)
Longest span32 ft (9.8 m)
Deck width31 ft (9.6 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,429 (2023)
Projected traffic2,114 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

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 12A over Little Sugar River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Nh 12A 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 12A over Little Sugar River carry?

About 1,429 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Nh 12A over Little Sugar River?

The structure is 36 ft (11 m) long with a longest span of 32 ft (9.8 m) and a deck 31 ft wide.

Who owns Nh 12A over Little Sugar River?

It is owned by the State Highway Agency.