US Bridges

Riverside Drive over Stony Brook

Good

Grafton County, New Hampshire · .21 Mi. from Jct. US 4 · Structure no. 014401650010900

Built
1997
28 years old
Condition
Good
inspected July 2024
Type
Culvert
Concrete
Length
40 ft
1 main span
Daily traffic
1,736
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Riverside Drive over Stony Brook is a concrete culvert carrying Riverside Drive over Stony Brook in Grafton County, New Hampshire. It was built in 1997, so it is 28 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,736 vehicles a day, roughly 4% of them trucks, projected to reach 2,569 by 2043. The structure is 40 ft (12.2 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesRiverside Drive
CrossesStony Brook
Location.21 Mi. from Jct. US 4
RouteCity Street 0
CountyGrafton County
StateNew Hampshire
Coordinates43.63626, -72.20955
Functional classUrban Collector

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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating63.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 25 or greater
Structure length40 ft (12.2 m)
Longest span40 ft (12.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,736 (2023)
Projected traffic2,569 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Riverside Drive over Stony Brook built?

It was built in 1997, making it 28 years old in 2025.

What condition is Riverside Drive over Stony 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 July 2024.

How much traffic does Riverside Drive over Stony Brook carry?

About 1,736 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Riverside Drive over Stony Brook?

The structure is 40 ft (12.2 m) long with a longest span of 40 ft (12.2 m).

Who owns Riverside Drive over Stony Brook?

It is owned by the City or Municipal Highway Agency.