US Bridges

North Road over Brook

FairPosted for load

Hillsborough County, New Hampshire · Town RD 0.80MI Lydboro Tl · Structure no. 025301100014300

Built
1940
85 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete
Length
25 ft
1 main span
Daily traffic
153
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

North Road over Brook is a concrete slab carrying North Road over Brook in Hillsborough County, New Hampshire. It was built in 1940, so it is 85 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. Its operating status is: posted for load restriction.

It carries about 153 vehicles a day, roughly 4% of them trucks, projected to reach 226 by 2043. The structure is 25 ft (7.6 m) long and 20 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesNorth Road
CrossesBrook
LocationTown RD 0.80MI Lydboro Tl
CountyHillsborough County
StateNew Hampshire
Coordinates42.86421, -71.83753
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30.6 US tons
Inventory rating18.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span20 ft (6.1 m)
Deck width20 ft (6.1 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic153 (2023)
Projected traffic226 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 North Road over Brook built?

It was built in 1940, making it 85 years old in 2025.

What condition is North Road over 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 North Road over Brook carry?

About 153 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is North Road over Brook?

The structure is 25 ft (7.6 m) long with a longest span of 20 ft (6.1 m) and a deck 20 ft wide.

Who owns North Road over Brook?

It is owned by the City or Municipal Highway Agency.