US Bridges

I-93 NB over Skookumchuck Brook

Fair

Grafton County, New Hampshire · 4 MI N. Lincoln T.L. · Structure no. 008701320009500

Built
1987
38 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
336 ft
3 main spans
Daily traffic
5,128
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 NB over Skookumchuck Brook is a steel continuous stringer/multi-beam or girder carrying I-93 NB 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 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 5,128 vehicles a day, roughly 9% of them trucks, projected to reach 7,589 by 2043. The structure is 336 ft (102.4 m) long and 57 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesI-93 NB
CrossesSkookumchuck Brook
Location4 MI N. Lincoln T.L.
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates44.19215, -71.68141
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating77.6 US tons
Inventory rating46.4 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 width57 ft (17.5 m)
Roadway width55 ft (16.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,128 (2023)
Projected traffic7,589 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 NB over Skookumchuck Brook built?

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

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

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

About 5,128 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 NB 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 57 ft wide.

Who owns I-93 NB over Skookumchuck Brook?

It is owned by the State Highway Agency.