US Bridges

I-293 NB Off Ramp over Merrimack River

Good

Hillsborough County, New Hampshire · At Granite ST Bridge · Structure no. 016101320006800

Built
1983
42 years old
Condition
Good
inspected April 2023
Type
Tee Beam
Concrete
Length
81 ft
1 main span
Daily traffic
9,517
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

I-293 NB Off Ramp over Merrimack River is a concrete tee beam carrying I-293 NB Off Ramp over Merrimack River in Hillsborough County, New Hampshire. It was built in 1983, so it is 42 years old, younger than the New Hampshire average of 56.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 9,517 vehicles a day, roughly 4% of them trucks, projected to reach 14,085 by 2043. The structure is 81 ft (24.7 m) long and 40 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesI-293 NB Off Ramp
CrossesMerrimack River
LocationAt Granite ST Bridge
CountyHillsborough County
StateNew Hampshire
Coordinates42.98478, -71.4703
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length81 ft (24.7 m)
Longest span76 ft (23.2 m)
Deck width40 ft (12.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,517 (2023)
Projected traffic14,085 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-293 NB Off Ramp over Merrimack River built?

It was built in 1983, making it 42 years old in 2025.

What condition is I-293 NB Off Ramp over Merrimack River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does I-293 NB Off Ramp over Merrimack River carry?

About 9,517 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is I-293 NB Off Ramp over Merrimack River?

The structure is 81 ft (24.7 m) long with a longest span of 76 ft (23.2 m) and a deck 40 ft wide.

Who owns I-293 NB Off Ramp over Merrimack River?

It is owned by the State Toll Authority.