US Bridges

I-89 SB over Nh 10

Fair

Sullivan County, New Hampshire · 2.1 MI from Springfield T · Structure no. 010001160008200

Built
1967
58 years old, rebuilt 2001
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
89 ft
1 main span
Daily traffic
9,692
2023 count
Owner
State
State Highway Agency

About this bridge

I-89 SB over Nh 10 is a prestressed concrete stringer/multi-beam or girder carrying I-89 SB over Nh 10 in Sullivan County, New Hampshire. It was built in 1967 and reconstructed in 2001, so it is 58 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 9,692 vehicles a day, roughly 9% of them trucks, projected to reach 14,344 by 2043. The structure is 89 ft (27.1 m) long and 44 ft wide.

CarriesI-89 SB
CrossesNh 10
Location2.1 MI from Springfield T
RouteInterstate 89
Coordinates43.49861, -72.13301
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.3 US tons
Inventory rating34.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length89 ft (27.1 m)
Longest span84 ft (25.6 m)
Deck width44 ft (13.4 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,692 (2023)
Projected traffic14,344 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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 SB over Nh 10 built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 2001.

What condition is I-89 SB 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 SB over Nh 10 carry?

About 9,692 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-89 SB over Nh 10?

The structure is 89 ft (27.1 m) long with a longest span of 84 ft (25.6 m) and a deck 44 ft wide.

Who owns I-89 SB over Nh 10?

It is owned by the State Highway Agency.