US Bridges

I-393 US 4 US202W over Nh 9

Good

Merrimack County, New Hampshire · .5 MI E Concord Tl · Structure no. 020600450008400

Built
1988
37 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
161 ft
1 main span
Daily traffic
8,164
2023 count
Owner
State
State Highway Agency

About this bridge

I-393 US 4 US202W over Nh 9 is a steel stringer/multi-beam or girder carrying I-393 US 4 US202W over Nh 9 in Merrimack County, New Hampshire. It was built in 1988, so it is 37 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 8,164 vehicles a day, roughly 7% of them trucks, projected to reach 12,082 by 2043. The structure is 161 ft (49 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-393 US 4 US202W
CrossesNh 9
Location.5 MI E Concord Tl
RouteInterstate 393
CountyMerrimack County
StateNew Hampshire
Coordinates43.24109, -71.45756
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.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92.3 US tons
Inventory rating55.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length161 ft (49 m)
Longest span150 ft (45.7 m)
Deck width31 ft (9.3 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,164 (2023)
Projected traffic12,082 by 2043
Trucks7%
Lanes on structure1
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-393 US 4 US202W over Nh 9 built?

It was built in 1988, making it 37 years old in 2025.

What condition is I-393 US 4 US202W over Nh 9 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-393 US 4 US202W over Nh 9 carry?

About 8,164 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-393 US 4 US202W over Nh 9?

The structure is 161 ft (49 m) long with a longest span of 150 ft (45.7 m) and a deck 31 ft wide.

Who owns I-393 US 4 US202W over Nh 9?

It is owned by the State Highway Agency.