US Bridges

I-93 SB over Clarks RR Pemigewasset R

Good

Grafton County, New Hampshire · 1.56 MI N Woodstock Tl · Structure no. 014802070009900

Built
1973
52 years old, rebuilt 1982
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
231 ft
2 main spans
Daily traffic
5,785
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 SB over Clarks RR Pemigewasset R is a steel continuous stringer/multi-beam or girder carrying I-93 SB over Clarks RR Pemigewasset R in Grafton County, New Hampshire. It was built in 1973 and reconstructed in 1982, 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 5,785 vehicles a day, roughly 9% of them trucks, projected to reach 8,561 by 2043. The structure is 231 ft (70.4 m) long and 53 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesI-93 SB
CrossesClarks RR Pemigewasset R
Location1.56 MI N Woodstock Tl
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates44.06, -71.68577
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
Deck7 GoodSome minor problems.
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 geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length231 ft (70.4 m)
Longest span113 ft (34.4 m)
Deck width53 ft (16.2 m)
Roadway width49 ft (14.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,785 (2023)
Projected traffic8,561 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad and waterway
Detour if closed9.9 mi (16 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 Clarks RR Pemigewasset R built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 1982.

What condition is I-93 SB over Clarks RR Pemigewasset R 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 SB over Clarks RR Pemigewasset R carry?

About 5,785 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 SB over Clarks RR Pemigewasset R?

The structure is 231 ft (70.4 m) long with a longest span of 113 ft (34.4 m) and a deck 53 ft wide.

Who owns I-93 SB over Clarks RR Pemigewasset R?

It is owned by the State Highway Agency.