US Bridges

Chambers Road over Cherry Mill Brook

FairPosted for load

Coos County, New Hampshire · .6 MI FR Carrol Tl · Structure no. 013501010004700

Built
1920
105 years old, rebuilt 1995
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
41 ft
1 main span
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Chambers Road over Cherry Mill Brook is a steel stringer/multi-beam or girder carrying Chambers Road over Cherry Mill Brook in Coos County, New Hampshire. It was built in 1920 and reconstructed in 1995, so it is 105 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 96 vehicles a day, projected to reach 142 by 2043. The structure is 41 ft (12.5 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesChambers Road
CrossesCherry Mill Brook
Location.6 MI FR Carrol Tl
CountyCoos County
StateNew Hampshire
Coordinates44.35344, -71.46409
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating19.3 US tons
Inventory rating11.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length41 ft (12.5 m)
Longest span37 ft (11.3 m)
Deck width16 ft (5 m)
Roadway width9 ft (2.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96 (2023)
Projected traffic142 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Chambers Road over Cherry Mill Brook built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1995.

What condition is Chambers Road over Cherry Mill 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 September 2024.

How much traffic does Chambers Road over Cherry Mill Brook carry?

About 96 vehicles per day (2023 count).

How long is Chambers Road over Cherry Mill Brook?

The structure is 41 ft (12.5 m) long with a longest span of 37 ft (11.3 m) and a deck 16 ft wide.

Who owns Chambers Road over Cherry Mill Brook?

It is owned by the City or Municipal Highway Agency.