US Bridges

Oak Street over Sugar River

Fair

Sullivan County, New Hampshire · 0.5 MI FR No. Newport RD · Structure no. 019201290011500

Built
1979
46 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
96 ft
1 main span
Daily traffic
890
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Oak Street over Sugar River is a steel stringer/multi-beam or girder carrying Oak Street over Sugar River in Sullivan County, New Hampshire. It was built in 1979, so it is 46 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 890 vehicles a day, roughly 4% of them trucks, projected to reach 1,317 by 2043. The structure is 96 ft (29.3 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesOak Street
CrossesSugar River
Location0.5 MI FR No. Newport RD
CountySullivan County
StateNew Hampshire
Coordinates43.37218, -72.18177
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.
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 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 rating49.3 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length96 ft (29.3 m)
Longest span89 ft (27.1 m)
Deck width36 ft (11.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic890 (2023)
Projected traffic1,317 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 Oak Street over Sugar River built?

It was built in 1979, making it 46 years old in 2025.

What condition is Oak Street 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 Oak Street over Sugar River carry?

About 890 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Oak Street over Sugar River?

The structure is 96 ft (29.3 m) long with a longest span of 89 ft (27.1 m) and a deck 36 ft wide.

Who owns Oak Street over Sugar River?

It is owned by the City or Municipal Highway Agency.