US Bridges

Nh 10 over Gunnison Brook

Fair

Sullivan County, New Hampshire · 1.78 MI N Lempster Tl · Structure no. 009800810011700

Built
1975
50 years old
Condition
Fair
inspected March 2024
Type
Frame
Concrete
Length
25 ft
1 main span
Daily traffic
2,873
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 10 over Gunnison Brook is a concrete frame carrying Nh 10 over Gunnison Brook in Sullivan County, New Hampshire. It was built in 1975, so it is 50 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 2,873 vehicles a day, roughly 4% of them trucks, projected to reach 4,252 by 2043. The structure is 25 ft (7.6 m) long and 45 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesNh 10
CrossesGunnison Brook
Location1.78 MI N Lempster Tl
RouteState Highway 10
CountySullivan County
StateNew Hampshire
Coordinates43.30133, -72.14868
Functional classRural Major Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating45 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length25 ft (7.6 m)
Longest span22 ft (6.7 m)
Deck width45 ft (13.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,873 (2023)
Projected traffic4,252 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
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 Nh 10 over Gunnison Brook built?

It was built in 1975, making it 50 years old in 2025.

What condition is Nh 10 over Gunnison 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 March 2024.

How much traffic does Nh 10 over Gunnison Brook carry?

About 2,873 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Nh 10 over Gunnison Brook?

The structure is 25 ft (7.6 m) long with a longest span of 22 ft (6.7 m) and a deck 45 ft wide.

Who owns Nh 10 over Gunnison Brook?

It is owned by the State Highway Agency.