US Bridges

I-93 NB over West Road

Good

Merrimack County, New Hampshire · 3.1 MI No. Concord T.L. · Structure no. 003800810008200

Built
1960
65 years old, rebuilt 1991
Condition
Good
inspected June 2024
Type
Frame
Concrete
Length
38 ft
1 main span
Daily traffic
19,156
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 NB over West Road is a concrete frame carrying I-93 NB over West Road in Merrimack County, New Hampshire. It was built in 1960 and reconstructed in 1991, so it is 65 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 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 19,156 vehicles a day, roughly 9% of them trucks, projected to reach 28,350 by 2043. The structure is 38 ft (11.6 m) long and 51 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

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CarriesI-93 NB
CrossesWest Road
Location3.1 MI No. Concord T.L.
RouteInterstate 93
CountyMerrimack County
StateNew Hampshire
Coordinates43.33141, -71.60524
Functional classRural 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.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating69.4 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length38 ft (11.6 m)
Longest span34 ft (10.4 m)
Deck width51 ft (15.5 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,156 (2023)
Projected traffic28,350 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed14.3 mi (23 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-93 NB over West Road built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1991.

What condition is I-93 NB over West Road 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 June 2024.

How much traffic does I-93 NB over West Road carry?

About 19,156 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 NB over West Road?

The structure is 38 ft (11.6 m) long with a longest span of 34 ft (10.4 m) and a deck 51 ft wide.

Who owns I-93 NB over West Road?

It is owned by the State Highway Agency.