US Bridges

I-93 SB over Skookumchuck Brook

Good

Grafton County, New Hampshire · 4 MI N Lincoln T.L. · Structure no. 008701310009500

Built
1987
38 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
336 ft
3 main spans
Daily traffic
5,092
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 SB over Skookumchuck Brook is a steel continuous stringer/multi-beam or girder carrying I-93 SB over Skookumchuck Brook in Grafton County, New Hampshire. It was built in 1987, so it is 38 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 5,092 vehicles a day, roughly 9% of them trucks, projected to reach 7,536 by 2043. The structure is 336 ft (102.4 m) long and 63 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesI-93 SB
CrossesSkookumchuck Brook
Location4 MI N Lincoln T.L.
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates44.19222, -71.68167
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating85.1 US tons
Inventory rating50.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length336 ft (102.4 m)
Longest span130 ft (39.6 m)
Deck width63 ft (19.3 m)
Roadway width59 ft (18.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,092 (2023)
Projected traffic7,536 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 Skookumchuck Brook built?

It was built in 1987, making it 38 years old in 2025.

What condition is I-93 SB over Skookumchuck Brook 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 August 2023.

How much traffic does I-93 SB over Skookumchuck Brook carry?

About 5,092 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 SB over Skookumchuck Brook?

The structure is 336 ft (102.4 m) long with a longest span of 130 ft (39.6 m) and a deck 63 ft wide.

Who owns I-93 SB over Skookumchuck Brook?

It is owned by the State Highway Agency.