US Bridges

Nh 10 over Jacobs Brook

Fair

Grafton County, New Hampshire · 3.4 MI from Lyme Tl · Structure no. 020300750012600

Built
1938
87 years old, rebuilt 1981
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
38 ft
1 main span
Daily traffic
1,375
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 10 over Jacobs Brook is a concrete culvert carrying Nh 10 over Jacobs Brook in Grafton County, New Hampshire. It was built in 1938 and reconstructed in 1981, so it is 87 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 5 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 1,375 vehicles a day, roughly 7% of them trucks, projected to reach 2,035 by 2043. The structure is 38 ft (11.6 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNh 10
CrossesJacobs Brook
Location3.4 MI from Lyme Tl
RouteState Highway 10
CountyGrafton County
StateNew Hampshire
Coordinates43.90958, -72.12665
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 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
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating60.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadH 15
Structure length38 ft (11.6 m)
Longest span38 ft (11.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,375 (2023)
Projected traffic2,035 by 2043
Trucks7%
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

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 Jacobs Brook built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1981.

What condition is Nh 10 over Jacobs 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 June 2023.

How much traffic does Nh 10 over Jacobs Brook carry?

About 1,375 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 10 over Jacobs Brook?

The structure is 38 ft (11.6 m) long with a longest span of 38 ft (11.6 m).

Who owns Nh 10 over Jacobs Brook?

It is owned by the State Highway Agency.