US Bridges

River Road over Fogg Brook

Fair

Grafton County, New Hampshire · 3.89 MI N. of Jct. 104 · Structure no. 003001700008900

Built
1974
51 years old
Condition
Fair
inspected July 2023
Type
Culvert
Steel
Length
20 ft
1 main span
Daily traffic
436
2023 count
Owner
State
State Highway Agency

About this bridge

River Road over Fogg Brook is a steel culvert carrying River Road over Fogg Brook in Grafton County, New Hampshire. It was built in 1974, so it is 51 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 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 436 vehicles a day, roughly 4% of them trucks, projected to reach 645 by 2043. The structure is 20 ft (6.1 m) long. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesRiver Road
CrossesFogg Brook
Location3.89 MI N. of Jct. 104
RouteState Highway 0
CountyGrafton County
StateNew Hampshire
Coordinates43.65373, -71.6565
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
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 alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadH 20
Structure length20 ft (6.1 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic436 (2023)
Projected traffic645 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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 Fogg Brook built?

It was built in 1974, making it 51 years old in 2025.

What condition is River Road over Fogg 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 July 2023.

How much traffic does River Road over Fogg Brook carry?

About 436 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is River Road over Fogg Brook?

The structure is 20 ft (6.1 m) long with a longest span of 20 ft (6.1 m).

Who owns River Road over Fogg Brook?

It is owned by the State Highway Agency.