US Bridges

I-93 SB over US 3

Fair

Grafton County, New Hampshire · 0.2 MI Campton Tl · Structure no. 025402430007600

Built
1968
57 years old, rebuilt 2001
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
105 ft
1 main span
Daily traffic
7,818
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 SB over US 3 is a steel stringer/multi-beam or girder carrying I-93 SB over US 3 in Grafton County, New Hampshire. It was built in 1968 and reconstructed in 2001, so it is 57 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 5 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 7,818 vehicles a day, roughly 10% of them trucks, projected to reach 11,570 by 2043. The structure is 105 ft (32 m) long and 58 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

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CarriesI-93 SB
CrossesUS 3
Location0.2 MI Campton Tl
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates43.86934, -71.66782
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.7 US tons
Inventory rating44.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length105 ft (32 m)
Longest span100 ft (30.5 m)
Deck width58 ft (17.7 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,818 (2023)
Projected traffic11,570 by 2043
Trucks10%
Lanes on structure3
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 US 3 built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2001.

What condition is I-93 SB over US 3 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 April 2023.

How much traffic does I-93 SB over US 3 carry?

About 7,818 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is I-93 SB over US 3?

The structure is 105 ft (32 m) long with a longest span of 100 ft (30.5 m) and a deck 58 ft wide.

Who owns I-93 SB over US 3?

It is owned by the State Highway Agency.