US Bridges

Brook Road over Brock Brook

Fair

Grafton County, New Hampshire · 0.5 MI FR Shem Valley RD · Structure no. 000301010012000

Built
1930
95 years old, rebuilt 2016
Condition
Fair
inspected August 2023
Type
Slab
Wood or Timber
Length
31 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 wood or timber slab carrying Brook Road over Brock Brook in Grafton County, New Hampshire. It was built in 1930 and reconstructed in 2016, so it is 95 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 56 vehicles a day, roughly 4% of them trucks, projected to reach 82 by 2043. The structure is 31 ft (9.4 m) long and 16 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesBrook Road
CrossesBrock Brook
Location0.5 MI FR Shem Valley RD
CountyGrafton County
StateNew Hampshire
Coordinates43.64241, -71.84529
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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span28 ft (8.5 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56 (2023)
Projected traffic82 by 2043
Trucks4%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 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 Brook Road over Brock Brook built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 2016.

What condition is Brook Road over Brock 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 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 31 ft (9.4 m) long with a longest span of 28 ft (8.5 m) and a deck 16 ft wide.

Who owns Brook Road over Brock Brook?

It is owned by the City or Municipal Highway Agency.