US Bridges

I-89 SB over Otterville Road

Fair

Merrimack County, New Hampshire · 4.4 MI from Sutton Tl · Structure no. 018800660010500

Built
1967
58 years old, rebuilt 1988
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
75 ft
1 main span
Daily traffic
9,402
2023 count
Owner
State
State Highway Agency

About this bridge

I-89 SB over Otterville Road is a steel stringer/multi-beam or girder carrying I-89 SB over Otterville Road in Merrimack County, New Hampshire. It was built in 1967 and reconstructed in 1988, 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 9,402 vehicles a day, roughly 9% of them trucks, projected to reach 13,914 by 2043. The structure is 75 ft (22.9 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-89 SB
CrossesOtterville Road
Location4.4 MI from Sutton Tl
RouteInterstate 89
CountyMerrimack County
StateNew Hampshire
Coordinates43.42825, -72.04023
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 rating56.7 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length75 ft (22.9 m)
Longest span70 ft (21.3 m)
Deck width44 ft (13.4 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,402 (2023)
Projected traffic13,914 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 Otterville Road built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 1988.

What condition is I-89 SB over Otterville Road 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 Otterville Road carry?

About 9,402 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-89 SB over Otterville Road?

The structure is 75 ft (22.9 m) long with a longest span of 70 ft (21.3 m) and a deck 44 ft wide.

Who owns I-89 SB over Otterville Road?

It is owned by the State Highway Agency.