US Bridges

Nh 12 over White Bridge Brook

Fair

Cheshire County, New Hampshire · 1.3 MI Surry Tl · Structure no. 027201670012200

Built
1941
84 years old, rebuilt 1987
Condition
Fair
inspected June 2024
Type
Slab
Concrete
Length
26 ft
1 main span
Daily traffic
6,478
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 12 over White Bridge Brook is a concrete slab carrying Nh 12 over White Bridge Brook in Cheshire County, New Hampshire. It was built in 1941 and reconstructed in 1987, so it is 84 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 6,478 vehicles a day, roughly 7% of them trucks, projected to reach 9,587 by 2043. The structure is 26 ft (7.9 m) long and 36 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesNh 12
CrossesWhite Bridge Brook
Location1.3 MI Surry Tl
RouteState Highway 12
CountyCheshire County
StateNew Hampshire
Coordinates42.99035, -72.39006
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length26 ft (7.9 m)
Longest span24 ft (7.3 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,478 (2023)
Projected traffic9,587 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 12 over White Bridge Brook built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 1987.

What condition is Nh 12 over White Bridge 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 June 2024.

How much traffic does Nh 12 over White Bridge Brook carry?

About 6,478 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 12 over White Bridge Brook?

The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.3 m) and a deck 36 ft wide.

Who owns Nh 12 over White Bridge Brook?

It is owned by the State Highway Agency.