US Bridges

Bunker Hill Road over Needle Shop Brook

Good

Merrimack County, New Hampshire · 2.1 MI FR · Structure no. 012301400009900

Built
1960
65 years old, rebuilt 2020
Condition
Good
inspected July 2024
Type
Slab
Prestressed Concrete
Length
25 ft
1 main span
Daily traffic
112
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Bunker Hill Road over Needle Shop Brook is a prestressed concrete slab carrying Bunker Hill Road over Needle Shop Brook in Merrimack County, New Hampshire. It was built in 1960 and reconstructed in 2020, so it is 65 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 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 112 vehicles a day, roughly 4% of them trucks, projected to reach 165 by 2043. The structure is 25 ft (7.6 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesBunker Hill Road
CrossesNeedle Shop Brook
Location2.1 MI FR
Coordinates43.52237, -71.73161
Functional classRural 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 inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating46.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length25 ft (7.6 m)
Longest span23 ft (7 m)
Deck width26 ft (7.9 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic112 (2023)
Projected traffic165 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Bunker Hill Road over Needle Shop Brook built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2020.

What condition is Bunker Hill Road over Needle Shop 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 July 2024.

How much traffic does Bunker Hill Road over Needle Shop Brook carry?

About 112 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Bunker Hill Road over Needle Shop Brook?

The structure is 25 ft (7.6 m) long with a longest span of 23 ft (7 m) and a deck 26 ft wide.

Who owns Bunker Hill Road over Needle Shop Brook?

It is owned by the City or Municipal Highway Agency.