US Bridges

I-93 SB over US 3 Pemigewasset River

Fair

Grafton County, New Hampshire · 2.7 MI Plymouth Tl · Structure no. 003501210008800

Built
1969
56 years old, rebuilt 2004
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
579 ft
4 main spans
Daily traffic
10,052
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 SB over US 3 Pemigewasset River is a steel continuous stringer/multi-beam or girder carrying I-93 SB over US 3 Pemigewasset River in Grafton County, New Hampshire. It was built in 1969 and reconstructed in 2004, so it is 56 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 10,052 vehicles a day, roughly 9% of them trucks, projected to reach 14,876 by 2043. The structure is 579 ft (176.5 m) long and 44 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesI-93 SB
CrossesUS 3 Pemigewasset River
Location2.7 MI Plymouth Tl
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates43.81838, -71.66238
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.2 US tons
Inventory rating33.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length579 ft (176.5 m)
Longest span153 ft (46.6 m)
Deck width44 ft (13.5 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,052 (2023)
Projected traffic14,876 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed6.8 mi (11 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)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-93 SB over US 3 Pemigewasset River built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 2004.

What condition is I-93 SB over US 3 Pemigewasset River 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 July 2023.

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

About 10,052 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 SB over US 3 Pemigewasset River?

The structure is 579 ft (176.5 m) long with a longest span of 153 ft (46.6 m) and a deck 44 ft wide.

Who owns I-93 SB over US 3 Pemigewasset River?

It is owned by the State Highway Agency.