US Bridges

I-93 NB over Nh 3A

Fair

Merrimack County, New Hampshire · 1.0 MI N Manchester Cl · Structure no. 012800760007900

Built
1976
49 years old, rebuilt 2012
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
140 ft
1 main span
Daily traffic
25,712
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 NB over Nh 3A is a steel stringer/multi-beam or girder carrying I-93 NB over Nh 3A in Merrimack County, New Hampshire. It was built in 1976 and reconstructed in 2012, so it is 49 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 fair condition with a lowest component rating of 6 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 25,712 vehicles a day, roughly 9% of them trucks, projected to reach 38,053 by 2043. The structure is 140 ft (42.7 m) long and 75 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-93 NB
CrossesNh 3A
Location1.0 MI N Manchester Cl
RouteInterstate 93
CountyMerrimack County
StateNew Hampshire
Coordinates43.04413, -71.46491
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length140 ft (42.7 m)
Longest span134 ft (40.8 m)
Deck width75 ft (22.9 m)
Roadway width71 ft (21.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,712 (2023)
Projected traffic38,053 by 2043
Trucks9%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 Nh 3A built?

It was built in 1976, making it 49 years old in 2025. It was reconstructed in 2012.

What condition is I-93 NB over Nh 3A 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 June 2024.

How much traffic does I-93 NB over Nh 3A carry?

About 25,712 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 NB over Nh 3A?

The structure is 140 ft (42.7 m) long with a longest span of 134 ft (40.8 m) and a deck 75 ft wide.

Who owns I-93 NB over Nh 3A?

It is owned by the State Highway Agency.