US Bridges

I-89(RAMP A) over Turkey River

Fair

Merrimack County, New Hampshire · Bow Interchange · Structure no. 002701350016100

Built
1959
66 years old
Condition
Fair
inspected April 2024
Type
Frame
Concrete Continuous
Length
33 ft
2 main spans
Daily traffic
30,513
2023 count
Owner
State
State Highway Agency

About this bridge

I-89(RAMP A) over Turkey River is a concrete continuous frame carrying I-89(RAMP A) over Turkey River in Merrimack County, New Hampshire. It was built in 1959, 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 30,513 vehicles a day, roughly 6% of them trucks, projected to reach 45,159 by 2043. The structure is 33 ft (10.1 m) long and 120 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesI-89(RAMP A)
CrossesTurkey River
LocationBow Interchange
CountyMerrimack County
StateNew Hampshire
Coordinates43.17111, -71.52907
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating75 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span13 ft (4.1 m)
Deck width120 ft (36.6 m)
Roadway width74 ft (22.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,513 (2023)
Projected traffic45,159 by 2043
Trucks6%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 A) over Turkey River built?

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

What condition is I-89(RAMP A) 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 A) over Turkey River carry?

About 30,513 vehicles per day (2023 count), of which roughly 6% are trucks.

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

The structure is 33 ft (10.1 m) long with a longest span of 13 ft (4.1 m) and a deck 120 ft wide.

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

It is owned by the State Highway Agency.