US Bridges

I-93 NB Off Ramp over Pemigewasset R Clarks RR

Good

Grafton County, New Hampshire · 1.61 MI N Woodstock Tl · Structure no. 014802020010000

Built
1973
52 years old, rebuilt 2014
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
253 ft
2 main spans
Daily traffic
554
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 NB Off Ramp over Pemigewasset R Clarks RR is a steel continuous stringer/multi-beam or girder carrying I-93 NB Off Ramp over Pemigewasset R Clarks RR in Grafton County, New Hampshire. It was built in 1973 and reconstructed in 2014, so it is 52 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 554 vehicles a day, roughly 5% of them trucks, projected to reach 819 by 2043. The structure is 253 ft (77.1 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-93 NB Off Ramp
CrossesPemigewasset R Clarks RR
Location1.61 MI N Woodstock Tl
CountyGrafton County
StateNew Hampshire
Coordinates44.06087, -71.68543
Functional classRural 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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.3 US tons
Inventory rating52.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length253 ft (77.1 m)
Longest span122 ft (37.2 m)
Deck width31 ft (9.4 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic554 (2023)
Projected traffic819 by 2043
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad and waterway
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)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-93 NB Off Ramp over Pemigewasset R Clarks RR built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 2014.

What condition is I-93 NB Off Ramp over Pemigewasset R Clarks RR 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 May 2023.

How much traffic does I-93 NB Off Ramp over Pemigewasset R Clarks RR carry?

About 554 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is I-93 NB Off Ramp over Pemigewasset R Clarks RR?

The structure is 253 ft (77.1 m) long with a longest span of 122 ft (37.2 m) and a deck 31 ft wide.

Who owns I-93 NB Off Ramp over Pemigewasset R Clarks RR?

It is owned by the State Highway Agency.