US Bridges

River Road over Brook

Fair

Grafton County, New Hampshire · .72 Mi. SW Jct. 10 and 25 · Structure no. 020900660015900

Built
1951
74 years old, rebuilt 1987
Condition
Fair
inspected April 2023
Type
Slab
Concrete
Length
27 ft
1 main span
Daily traffic
943
2023 count
Owner
State
State Highway Agency

About this bridge

River Road over Brook is a concrete slab carrying River Road over Brook in Grafton County, New Hampshire. It was built in 1951 and reconstructed in 1987, so it is 74 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 943 vehicles a day, roughly 4% of them trucks, projected to reach 1,395 by 2043. The structure is 27 ft (8.1 m) long and 36 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesRiver Road
CrossesBrook
Location.72 Mi. SW Jct. 10 and 25
RouteState Highway 0
CountyGrafton County
StateNew Hampshire
Coordinates44.01589, -72.08076
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41 US tons
Inventory rating24.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length27 ft (8.1 m)
Longest span22 ft (6.7 m)
Deck width36 ft (10.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic943 (2023)
Projected traffic1,395 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 River Road over Brook built?

It was built in 1951, making it 74 years old in 2025. It was reconstructed in 1987.

What condition is River 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 April 2023.

How much traffic does River Road over Brook carry?

About 943 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is River Road over Brook?

The structure is 27 ft (8.1 m) long with a longest span of 22 ft (6.7 m) and a deck 36 ft wide.

Who owns River Road over Brook?

It is owned by the State Highway Agency.