US Bridges

I-89 SB over Nh 10

Fair

Sullivan County, New Hampshire · 5.01 MI from Springfield · Structure no. 010001090013900

Built
1972
53 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
82 ft
1 main span
Daily traffic
10,987
2023 count
Owner
State
State Highway Agency

About this bridge

I-89 SB over Nh 10 is a steel stringer/multi-beam or girder carrying I-89 SB over Nh 10 in Sullivan County, New Hampshire. It was built in 1972, so it is 53 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 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 10,987 vehicles a day, roughly 9% of them trucks, projected to reach 16,260 by 2043. The structure is 82 ft (25 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-89 SB
CrossesNh 10
Location5.01 MI from Springfield
RouteInterstate 89
CountySullivan County
StateNew Hampshire
Coordinates43.53872, -72.13875
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.3 US tons
Inventory rating33.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length82 ft (25 m)
Longest span76 ft (23.2 m)
Deck width45 ft (13.7 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,987 (2023)
Projected traffic16,260 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 SB over Nh 10 built?

It was built in 1972, making it 53 years old in 2025.

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 10,987 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-89 SB over Nh 10?

The structure is 82 ft (25 m) long with a longest span of 76 ft (23.2 m) and a deck 45 ft wide.

Who owns I-89 SB over Nh 10?

It is owned by the State Highway Agency.