US Bridges

Cobble Hill Road over California Brook

Good

Cheshire County, New Hampshire · 0.10MI RTE 10 · Structure no. 025100820011500

Built
2013
12 years old
Condition
Good
inspected August 2024
Type
Frame
Concrete
Length
45 ft
2 main spans
Daily traffic
425
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Cobble Hill Road over California Brook is a concrete frame carrying Cobble Hill Road over California Brook in Cheshire County, New Hampshire. It was built in 2013, so it is 12 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 425 vehicles a day, roughly 4% of them trucks, projected to reach 629 by 2043. The structure is 45 ft (13.7 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCobble Hill Road
CrossesCalifornia Brook
Location0.10MI RTE 10
CountyCheshire County
StateNew Hampshire
Coordinates42.86481, -72.3375
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81 US tons
Inventory rating48.6 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadHL 93
Structure length45 ft (13.7 m)
Longest span20 ft (6.1 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic425 (2023)
Projected traffic629 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Cobble Hill Road over California Brook built?

It was built in 2013, making it 12 years old in 2025.

What condition is Cobble Hill Road over California 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 2024.

How much traffic does Cobble Hill Road over California Brook carry?

About 425 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Cobble Hill Road over California Brook?

The structure is 45 ft (13.7 m) long with a longest span of 20 ft (6.1 m) and a deck 28 ft wide.

Who owns Cobble Hill Road over California Brook?

It is owned by the City or Municipal Highway Agency.