US Bridges

I-89 NB over Nh 10

Fair

Sullivan County, New Hampshire · 4.9 MI from Springfield T · Structure no. 010001100013800

Built
1959
66 years old, rebuilt 1973
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
81 ft
1 main span
Daily traffic
10,804
2023 count
Owner
State
State Highway Agency

About this bridge

I-89 NB over Nh 10 is a steel stringer/multi-beam or girder carrying I-89 NB over Nh 10 in Sullivan County, New Hampshire. It was built in 1959 and reconstructed in 1973, so it is 66 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 5 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 10,804 vehicles a day, roughly 9% of them trucks, projected to reach 15,989 by 2043. The structure is 81 ft (24.7 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-89 NB
CrossesNh 10
Location4.9 MI from Springfield T
RouteInterstate 89
CountySullivan County
StateNew Hampshire
Coordinates43.53837, -72.13839
Functional classRural Principal Arterial - Interstate

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.4 US tons
Inventory rating36.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length81 ft (24.7 m)
Longest span76 ft (23.2 m)
Deck width50 ft (15.2 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,804 (2023)
Projected traffic15,989 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-89 NB over Nh 10 built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1973.

What condition is I-89 NB over Nh 10 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 2023.

How much traffic does I-89 NB over Nh 10 carry?

About 10,804 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-89 NB over Nh 10?

The structure is 81 ft (24.7 m) long with a longest span of 76 ft (23.2 m) and a deck 50 ft wide.

Who owns I-89 NB over Nh 10?

It is owned by the State Highway Agency.