US Bridges

I-89(RAMP F) over Turkey River

Fair

Merrimack County, New Hampshire · Bow Interchange · Structure no. 002701300016100

Built
1959
66 years old, rebuilt 1980
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
68 ft
1 main span
Daily traffic
3,904
2023 count
Owner
State
State Highway Agency

About this bridge

I-89(RAMP F) over Turkey River is a steel stringer/multi-beam or girder carrying I-89(RAMP F) over Turkey River in Merrimack County, New Hampshire. It was built in 1959 and reconstructed in 1980, so it is 66 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 3,904 vehicles a day, roughly 6% of them trucks, projected to reach 5,777 by 2043. The structure is 68 ft (20.7 m) long and 50 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-89(RAMP F)
CrossesTurkey River
LocationBow Interchange
CountyMerrimack County
StateNew Hampshire
Coordinates43.16956, -71.53464
Functional classUrban 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 protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length68 ft (20.7 m)
Longest span65 ft (19.8 m)
Deck width50 ft (15.2 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,904 (2023)
Projected traffic5,777 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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(RAMP F) over Turkey River built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1980.

What condition is I-89(RAMP F) over Turkey 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 April 2024.

How much traffic does I-89(RAMP F) over Turkey River carry?

About 3,904 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-89(RAMP F) over Turkey River?

The structure is 68 ft (20.7 m) long with a longest span of 65 ft (19.8 m) and a deck 50 ft wide.

Who owns I-89(RAMP F) over Turkey River?

It is owned by the State Highway Agency.