US Bridges

Nh 3A So Main ST over Piscataquog River

Good

Hillsborough County, New Hampshire · 0.04 MI from Varney ST · Structure no. 016101400006200

Built
1894
131 years old, rebuilt 2003
Condition
Good
inspected July 2024
Type
Arch - Deck
Masonry
Length
82 ft
2 main spans
Daily traffic
12,740
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nh 3A So Main ST over Piscataquog River is a masonry arch - deck carrying Nh 3A So Main ST over Piscataquog River in Hillsborough County, New Hampshire. It was built in 1894 and reconstructed in 2003, so it is 131 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 12,740 vehicles a day, roughly 5% of them trucks, projected to reach 18,855 by 2043. The structure is 82 ft (25 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNh 3A So Main ST
CrossesPiscataquog River
Location0.04 MI from Varney ST
RouteCity Street 0
Coordinates42.98086, -71.47599
Functional classUrban Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.2 US tons
Inventory rating48.2 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length82 ft (25 m)
Longest span38 ft (11.6 m)
Deck width50 ft (15.2 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,740 (2023)
Projected traffic18,855 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusEligible 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 Nh 3A So Main ST over Piscataquog River built?

It was built in 1894, making it 131 years old in 2025. It was reconstructed in 2003.

What condition is Nh 3A So Main ST over Piscataquog River 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 Nh 3A So Main ST over Piscataquog River carry?

About 12,740 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Nh 3A So Main ST over Piscataquog River?

The structure is 82 ft (25 m) long with a longest span of 38 ft (11.6 m) and a deck 50 ft wide.

Who owns Nh 3A So Main ST over Piscataquog River?

It is owned by the City or Municipal Highway Agency.