US Bridges

I-89 NB over Warner River

Fair

Merrimack County, New Hampshire · 1.0 MI Hopkinton T.L. · Structure no. 026302440016700

Built
1966
59 years old, rebuilt 2008
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
159 ft
3 main spans
Daily traffic
10,232
2023 count
Owner
State
State Highway Agency

About this bridge

I-89 NB over Warner River is a steel continuous stringer/multi-beam or girder carrying I-89 NB over Warner River in Merrimack County, New Hampshire. It was built in 1966 and reconstructed in 2008, so it is 59 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 10,232 vehicles a day, roughly 9% of them trucks, projected to reach 15,143 by 2043. The structure is 159 ft (48.5 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-89 NB
CrossesWarner River
Location1.0 MI Hopkinton T.L.
RouteInterstate 89
CountyMerrimack County
StateNew Hampshire
Coordinates43.25489, -71.75152
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.9 US tons
Inventory rating45.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length159 ft (48.5 m)
Longest span60 ft (18.3 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,232 (2023)
Projected traffic15,143 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-89 NB over Warner River built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 2008.

What condition is I-89 NB over Warner 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 June 2023.

How much traffic does I-89 NB over Warner River carry?

About 10,232 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-89 NB over Warner River?

The structure is 159 ft (48.5 m) long with a longest span of 60 ft (18.3 m) and a deck 42 ft wide.

Who owns I-89 NB over Warner River?

It is owned by the State Highway Agency.