US Bridges

I-93 SB over NH132

Fair

Merrimack County, New Hampshire · 2.5MI S. Tilton Tl · Structure no. 019600950011400

Built
1959
66 years old, rebuilt 1985
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
185 ft
3 main spans
Daily traffic
17,906
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 SB over NH132 is a steel continuous stringer/multi-beam or girder carrying I-93 SB over NH132 in Merrimack County, New Hampshire. It was built in 1959 and reconstructed in 1985, so it is 66 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 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 17,906 vehicles a day, roughly 9% of them trucks, projected to reach 26,500 by 2043. The structure is 185 ft (56.4 m) long and 44 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

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CarriesI-93 SB
CrossesNH132
Location2.5MI S. Tilton Tl
RouteInterstate 93
CountyMerrimack County
StateNew Hampshire
Coordinates43.42094, -71.59253
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 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.2 US tons
Inventory rating36.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length185 ft (56.4 m)
Longest span77 ft (23.5 m)
Deck width44 ft (13.4 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,906 (2023)
Projected traffic26,500 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-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 SB over NH132 built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1985.

What condition is I-93 SB over NH132 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 2023.

How much traffic does I-93 SB over NH132 carry?

About 17,906 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 SB over NH132?

The structure is 185 ft (56.4 m) long with a longest span of 77 ft (23.5 m) and a deck 44 ft wide.

Who owns I-93 SB over NH132?

It is owned by the State Highway Agency.