US Bridges

I-93 Fee Tpk over Dow Road

Fair

Merrimack County, New Hampshire · 1.7 MI JCT I-89 · Structure no. 002701580013700

Built
1957
68 years old, rebuilt 1978
Condition
Fair
inspected April 2024
Type
Culvert
Concrete
Length
30 ft
1 main span
Daily traffic
78,501
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

I-93 Fee Tpk over Dow Road is a concrete culvert carrying I-93 Fee Tpk over Dow Road in Merrimack County, New Hampshire. It was built in 1957 and reconstructed in 1978, so it is 68 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 78,501 vehicles a day, roughly 9% of them trucks, projected to reach 116,181 by 2043. The structure is 30 ft (9.1 m) long. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesI-93 Fee Tpk
CrossesDow Road
Location1.7 MI JCT I-89
RouteInterstate 93
CountyMerrimack County
StateNew Hampshire
Coordinates43.15406, -71.5071
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
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating40.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic78,501 (2023)
Projected traffic116,181 by 2043
Trucks9%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed11.8 mi (19 km)
TollOn a toll road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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-93 Fee Tpk over Dow Road built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1978.

What condition is I-93 Fee Tpk over Dow 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 2024.

How much traffic does I-93 Fee Tpk over Dow Road carry?

About 78,501 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 Fee Tpk over Dow Road?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m).

Who owns I-93 Fee Tpk over Dow Road?

It is owned by the State Toll Authority.