US Bridges

Nh 11A over Poor Farm Brook

Fair

Belknap County, New Hampshire · 5.9 MI East Laconia Tl · Structure no. 009101380013700

Built
1936
89 years old, rebuilt 1984
Condition
Fair
inspected May 2023
Type
Tee Beam
Concrete
Length
32 ft
1 main span
Daily traffic
5,276
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 11A over Poor Farm Brook is a concrete tee beam carrying Nh 11A over Poor Farm Brook in Belknap County, New Hampshire. It was built in 1936 and reconstructed in 1984, so it is 89 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 5,276 vehicles a day, roughly 4% of them trucks, projected to reach 7,808 by 2043. The structure is 32 ft (9.8 m) long and 34 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesNh 11A
CrossesPoor Farm Brook
Location5.9 MI East Laconia Tl
RouteState Highway 11A
CountyBelknap County
StateNew Hampshire
Coordinates43.5553, -71.36406
Functional classUrban Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.8 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length32 ft (9.8 m)
Longest span30 ft (9.1 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,276 (2023)
Projected traffic7,808 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 11A over Poor Farm Brook built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1984.

What condition is Nh 11A over Poor Farm 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 May 2023.

How much traffic does Nh 11A over Poor Farm Brook carry?

About 5,276 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Nh 11A over Poor Farm Brook?

The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m) and a deck 34 ft wide.

Who owns Nh 11A over Poor Farm Brook?

It is owned by the State Highway Agency.