US Bridges

Belknap Avenue over Sugar River

Fair

Sullivan County, New Hampshire · 0.2 MI FR No. Main ST · Structure no. 019201310010600

Built
1974
51 years old, rebuilt 2006
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
92 ft
1 main span
Daily traffic
1,141
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Belknap Avenue over Sugar River is a prestressed concrete stringer/multi-beam or girder carrying Belknap Avenue over Sugar River in Sullivan County, New Hampshire. It was built in 1974 and reconstructed in 2006, so it is 51 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 1,141 vehicles a day, roughly 4% of them trucks, projected to reach 1,688 by 2043. The structure is 92 ft (27.9 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesBelknap Avenue
CrossesSugar River
Location0.2 MI FR No. Main ST
CountySullivan County
StateNew Hampshire
Coordinates43.36536, -72.18008
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length92 ft (27.9 m)
Longest span83 ft (25.3 m)
Deck width28 ft (8.5 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,141 (2023)
Projected traffic1,688 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 Belknap Avenue over Sugar River built?

It was built in 1974, making it 51 years old in 2025. It was reconstructed in 2006.

What condition is Belknap Avenue over 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 July 2024.

How much traffic does Belknap Avenue over Sugar River carry?

About 1,141 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Belknap Avenue over Sugar River?

The structure is 92 ft (27.9 m) long with a longest span of 83 ft (25.3 m) and a deck 28 ft wide.

Who owns Belknap Avenue over Sugar River?

It is owned by the City or Municipal Highway Agency.