US Bridges

Brook Road over Brock Brook

Good

Grafton County, New Hampshire · 0.8 MI FR Shin Valley RD · Structure no. 000301020012500

Built
2004
21 years old
Condition
Good
inspected August 2023
Type
Culvert
Concrete
Length
32 ft
1 main span
Daily traffic
56
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Brook Road over Brock Brook is a concrete culvert carrying Brook Road over Brock Brook in Grafton County, New Hampshire. It was built in 2004, so it is 21 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 good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 56 vehicles a day, roughly 4% of them trucks, projected to reach 82 by 2043. The structure is 32 ft (9.7 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesBrook Road
CrossesBrock Brook
Location0.8 MI FR Shin Valley RD
CountyGrafton County
StateNew Hampshire
Coordinates43.64438, -71.84198
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating75.2 US tons
Inventory rating45 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 25 or greater
Structure length32 ft (9.7 m)
Longest span32 ft (9.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56 (2023)
Projected traffic82 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible 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 Brook Road over Brock Brook built?

It was built in 2004, making it 21 years old in 2025.

What condition is Brook Road over Brock Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does Brook Road over Brock Brook carry?

About 56 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Brook Road over Brock Brook?

The structure is 32 ft (9.7 m) long with a longest span of 32 ft (9.7 m).

Who owns Brook Road over Brock Brook?

It is owned by the City or Municipal Highway Agency.