US Bridges

Second Nh Tpk over Brook

Fair

Hillsborough County, New Hampshire · 1.0 MI FR Antrim Tl · Structure no. 012200930004400

Built
1900
125 years old, rebuilt 2001
Condition
Fair
inspected October 2024
Type
Culvert
Masonry
Length
30 ft
1 main span
Daily traffic
721
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Second Nh Tpk over Brook is a masonry culvert carrying Second Nh Tpk over Brook in Hillsborough County, New Hampshire. It was built in 1900 and reconstructed in 2001, so it is 125 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 721 vehicles a day, roughly 4% of them trucks, projected to reach 1,067 by 2043. The structure is 30 ft (9.1 m) long and 20 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSecond Nh Tpk
CrossesBrook
Location1.0 MI FR Antrim Tl
CountyHillsborough County
StateNew Hampshire
Coordinates43.11146, -71.94305
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating75.1 US tons
Inventory rating75.1 US tons

Structure

Structure typeCulvert
MaterialMasonry
DeckNot applicable
Main spans1
Design loadHS 15
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width20 ft (6.1 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic721 (2023)
Projected traffic1,067 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusEligible for the National Register of Historic Places
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 Second Nh Tpk over Brook built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 2001.

What condition is Second Nh Tpk 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 October 2024.

How much traffic does Second Nh Tpk over Brook carry?

About 721 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Second Nh Tpk over Brook?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 20 ft wide.

Who owns Second Nh Tpk over Brook?

It is owned by the City or Municipal Highway Agency.