US Bridges

I-89 NB over Warner River

Fair

Merrimack County, New Hampshire · 6.2 MI Hopkinton Tl · Structure no. 026301660010400

Built
1966
59 years old, rebuilt 1992
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
161 ft
3 main spans
Daily traffic
10,883
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 1992, 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 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 10,883 vehicles a day, roughly 9% of them trucks, projected to reach 16,106 by 2043. The structure is 161 ft (49.1 m) long and 44 ft wide.

Location

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CarriesI-89 NB
CrossesWarner River
Location6.2 MI Hopkinton Tl
RouteInterstate 89
CountyMerrimack County
StateNew Hampshire
Coordinates43.28764, -71.83531
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.5 US tons
Inventory rating32.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length161 ft (49.1 m)
Longest span66 ft (20.1 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,883 (2023)
Projected traffic16,106 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 1992.

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 10,883 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-89 NB over Warner River?

The structure is 161 ft (49.1 m) long with a longest span of 66 ft (20.1 m) and a deck 44 ft wide.

Who owns I-89 NB over Warner River?

It is owned by the State Highway Agency.