US Bridges

Chamberlain Road over Contoocook River

Fair

Cheshire County, New Hampshire · Off Hadley Station Road · Structure no. 013401940010900

Built
1950
75 years old, rebuilt 1997
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
28 ft
1 main span
Daily traffic
50
1984 count
Owner
City
City or Municipal Highway Agency

About this bridge

Chamberlain Road over Contoocook River is a wood or timber stringer/multi-beam or girder carrying Chamberlain Road over Contoocook River in Cheshire County, New Hampshire. It was built in 1950 and reconstructed in 1997, so it is 75 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 50 vehicles a day, projected to reach 74 by 2004. The structure is 28 ft (8.5 m) long and 14 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesChamberlain Road
CrossesContoocook River
LocationOff Hadley Station Road
CountyCheshire County
StateNew Hampshire
Coordinates42.83311, -71.98765
Functional classRural Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 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 adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating62.5 US tons
Inventory rating46.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span22 ft (6.7 m)
Deck width14 ft (4.3 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (1984)
Projected traffic74 by 2004
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Chamberlain Road over Contoocook River built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1997.

What condition is Chamberlain Road over Contoocook River 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 July 2024.

How much traffic does Chamberlain Road over Contoocook River carry?

About 50 vehicles per day (1984 count).

How long is Chamberlain Road over Contoocook River?

The structure is 28 ft (8.5 m) long with a longest span of 22 ft (6.7 m) and a deck 14 ft wide.

Who owns Chamberlain Road over Contoocook River?

It is owned by the City or Municipal Highway Agency.