US Bridges

Town Road #79 over Jacobs Brook

Fair

Grafton County, New Hampshire · 125 Ft. Rte. 25A · Structure no. 020301160008900

Built
1930
95 years old, rebuilt 2006
Condition
Fair
inspected September 2023
Type
Slab
Prestressed Concrete
Length
38 ft
1 main span
Daily traffic
53
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Town Road #79 over Jacobs Brook is a prestressed concrete slab carrying Town Road #79 over Jacobs Brook in Grafton County, New Hampshire. It was built in 1930 and reconstructed in 2006, so it is 95 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 53 vehicles a day, roughly 4% of them trucks, projected to reach 78 by 2043. The structure is 38 ft (11.6 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesTown Road #79
CrossesJacobs Brook
Location125 Ft. Rte. 25A
CountyGrafton County
StateNew Hampshire
Coordinates43.88373, -72.08551
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span32 ft (9.8 m)
Deck width16 ft (4.8 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic53 (2023)
Projected traffic78 by 2043
Trucks4%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Town Road #79 over Jacobs Brook built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 2006.

What condition is Town Road #79 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 September 2023.

How much traffic does Town Road #79 over Jacobs Brook carry?

About 53 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Town Road #79 over Jacobs Brook?

The structure is 38 ft (11.6 m) long with a longest span of 32 ft (9.8 m) and a deck 16 ft wide.

Who owns Town Road #79 over Jacobs Brook?

It is owned by the City or Municipal Highway Agency.