US Bridges

Jennison Road over Hartshorn Brook

Good

Hillsborough County, New Hampshire · 1.1 MI FR Mt Vernon Tl · Structure no. 017200990015000

Built
2015
10 years old
Condition
Good
inspected June 2024
Type
Frame
Concrete
Length
31 ft
2 main spans
Daily traffic
1,236
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Jennison Road over Hartshorn Brook is a concrete frame carrying Jennison Road over Hartshorn Brook in Hillsborough County, New Hampshire. It was built in 2015, so it is 10 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,236 vehicles a day, roughly 4% of them trucks, projected to reach 1,829 by 2043. The structure is 31 ft (9.4 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesJennison Road
CrossesHartshorn Brook
Location1.1 MI FR Mt Vernon Tl
CountyHillsborough County
StateNew Hampshire
Coordinates42.85065, -71.67255
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.2 US tons
Inventory rating48.7 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadHL 93
Structure length31 ft (9.4 m)
Longest span14 ft (4.3 m)
Deck width27 ft (8.2 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,236 (2023)
Projected traffic1,829 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Jennison Road over Hartshorn Brook built?

It was built in 2015, making it 10 years old in 2025.

What condition is Jennison Road over Hartshorn 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 June 2024.

How much traffic does Jennison Road over Hartshorn Brook carry?

About 1,236 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Jennison Road over Hartshorn Brook?

The structure is 31 ft (9.4 m) long with a longest span of 14 ft (4.3 m) and a deck 27 ft wide.

Who owns Jennison Road over Hartshorn Brook?

It is owned by the City or Municipal Highway Agency.