US Bridges

Brook Road over Gunnison Brook

Fair

Sullivan County, New Hampshire · .05 MI NE of JCT Nh 10 · Structure no. 009800850011700

Built
1940
85 years old, rebuilt 1998
Condition
Fair
inspected March 2024
Type
Slab
Concrete
Length
29 ft
1 main span
Daily traffic
1,012
2023 count
Owner
State
State Highway Agency

About this bridge

Brook Road over Gunnison Brook is a concrete slab carrying Brook Road over Gunnison Brook in Sullivan County, New Hampshire. It was built in 1940 and reconstructed in 1998, so it is 85 years old, older 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 1,012 vehicles a day, roughly 10% of them trucks, projected to reach 1,497 by 2043. The structure is 29 ft (8.9 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesBrook Road
CrossesGunnison Brook
Location.05 MI NE of JCT Nh 10
RouteState Highway 0
CountySullivan County
StateNew Hampshire
Coordinates43.30136, -72.14761
Functional classRural Minor 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.
Substructure7 GoodSome minor problems.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating99 US tons
Inventory rating62.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length29 ft (8.9 m)
Longest span27 ft (8.2 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,012 (2023)
Projected traffic1,497 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Brook Road over Gunnison Brook built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1998.

What condition is Brook Road 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 Brook Road over Gunnison Brook carry?

About 1,012 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Brook Road over Gunnison Brook?

The structure is 29 ft (8.9 m) long with a longest span of 27 ft (8.2 m) and a deck 32 ft wide.

Who owns Brook Road over Gunnison Brook?

It is owned by the State Highway Agency.