US Bridges

I-89 Nh 10 SB over Skinner Brook

Fair

Sullivan County, New Hampshire · 4.43 MI Springfield T.L. · Structure no. 010001070012500

Built
1972
53 years old
Condition
Fair
inspected April 2023
Type
Culvert
Concrete
Length
24 ft
2 main spans
Daily traffic
10,987
2023 count
Owner
State
State Highway Agency

About this bridge

I-89 Nh 10 SB over Skinner Brook is a concrete culvert carrying I-89 Nh 10 SB over Skinner Brook in Sullivan County, New Hampshire. It was built in 1972, so it is 53 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 10,987 vehicles a day, roughly 9% of them trucks, projected to reach 16,260 by 2043. The structure is 24 ft (7.4 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-89 Nh 10 SB
CrossesSkinner Brook
Location4.43 MI Springfield T.L.
RouteInterstate 89
CountySullivan County
StateNew Hampshire
Coordinates43.53041, -72.14042
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length24 ft (7.4 m)
Longest span12 ft (3.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,987 (2023)
Projected traffic16,260 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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-89 Nh 10 SB over Skinner Brook built?

It was built in 1972, making it 53 years old in 2025.

What condition is I-89 Nh 10 SB over Skinner 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 April 2023.

How much traffic does I-89 Nh 10 SB over Skinner Brook carry?

About 10,987 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-89 Nh 10 SB over Skinner Brook?

The structure is 24 ft (7.4 m) long with a longest span of 12 ft (3.6 m).

Who owns I-89 Nh 10 SB over Skinner Brook?

It is owned by the State Highway Agency.