US Bridges

Sandwich Notch RD over Algonquin Brook

Fair

Carroll County, New Hampshire · 1.9 MI FR Thornton Tl · Structure no. 023300550015200

Built
1983
42 years old
Condition
Fair
inspected September 2024
Type
Slab
Wood or Timber
Length
26 ft
1 main span
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Sandwich Notch RD over Algonquin Brook is a wood or timber slab carrying Sandwich Notch RD over Algonquin Brook in Carroll County, New Hampshire. It was built in 1983, so it is 42 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 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.

It carries about 96 vehicles a day, roughly 4% of them trucks, projected to reach 142 by 2043. The structure is 26 ft (7.9 m) long and 15 ft wide. If it were closed, the detour would be 32.9 mi (53 km).

Location

Open in Google Maps
CarriesSandwich Notch RD
CrossesAlgonquin Brook
Location1.9 MI FR Thornton Tl
CountyCarroll County
StateNew Hampshire
Coordinates43.8624, -71.53639
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.
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 statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46 US tons
Inventory rating34 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span25 ft (7.6 m)
Deck width15 ft (4.6 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96 (2023)
Projected traffic142 by 2043
Trucks4%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed32.9 mi (53 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 Sandwich Notch RD over Algonquin Brook built?

It was built in 1983, making it 42 years old in 2025.

What condition is Sandwich Notch RD over Algonquin 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 Sandwich Notch RD over Algonquin Brook carry?

About 96 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Sandwich Notch RD over Algonquin Brook?

The structure is 26 ft (7.9 m) long with a longest span of 25 ft (7.6 m) and a deck 15 ft wide.

Who owns Sandwich Notch RD over Algonquin Brook?

It is owned by the City or Municipal Highway Agency.