US Bridges

Nh 10 over Trout Brook

Fair

Grafton County, New Hampshire · 5.58 MI N of Hanover Tl · Structure no. 015700890014400

Built
1969
56 years old
Condition
Fair
inspected May 2024
Type
Culvert
Steel
Length
28 ft
2 main spans
Daily traffic
1,862
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 10 over Trout Brook is a steel culvert carrying Nh 10 over Trout Brook in Grafton County, New Hampshire. It was built in 1969, so it is 56 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 1,862 vehicles a day, roughly 7% of them trucks, projected to reach 2,755 by 2043. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 55.3 mi (89 km).

Location

Open in Google Maps
CarriesNh 10
CrossesTrout Brook
Location5.58 MI N of Hanover Tl
RouteState Highway 10
CountyGrafton County
StateNew Hampshire
Coordinates43.83314, -72.14667
Functional classRural Minor Arterial

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
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 spans2
Design loadH 20
Structure length28 ft (8.5 m)
Longest span13 ft (4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,862 (2023)
Projected traffic2,755 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed55.3 mi (89 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 Nh 10 over Trout Brook built?

It was built in 1969, making it 56 years old in 2025.

What condition is Nh 10 over Trout 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 May 2024.

How much traffic does Nh 10 over Trout Brook carry?

About 1,862 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 10 over Trout Brook?

The structure is 28 ft (8.5 m) long with a longest span of 13 ft (4 m).

Who owns Nh 10 over Trout Brook?

It is owned by the State Highway Agency.