US Bridges

So New Boston Road over S Br Piscataquog River

Good

Hillsborough County, New Hampshire · 0.67MI. New Boston Tl · Structure no. 008601490005800

Built
2020
5 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
106 ft
1 main span
Daily traffic
289
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

So New Boston Road over S Br Piscataquog River is a steel stringer/multi-beam or girder carrying So New Boston Road over S Br Piscataquog River in Hillsborough County, New Hampshire. It was built in 2020, so it is 5 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 289 vehicles a day, roughly 4% of them trucks, projected to reach 427 by 2043. The structure is 106 ft (32.3 m) long and 24 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSo New Boston Road
CrossesS Br Piscataquog River
Location0.67MI. New Boston Tl
CountyHillsborough County
StateNew Hampshire
Coordinates42.95988, -71.7602
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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment8: Equal to present desirable criteria
Operating rating37.5 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length106 ft (32.3 m)
Longest span82 ft (25 m)
Deck width24 ft (7.3 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic289 (2023)
Projected traffic427 by 2043
Trucks4%
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

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 So New Boston Road over S Br Piscataquog River built?

It was built in 2020, making it 5 years old in 2025.

What condition is So New Boston Road over S Br 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 October 2024.

How much traffic does So New Boston Road over S Br Piscataquog River carry?

About 289 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is So New Boston Road over S Br Piscataquog River?

The structure is 106 ft (32.3 m) long with a longest span of 82 ft (25 m) and a deck 24 ft wide.

Who owns So New Boston Road over S Br Piscataquog River?

It is owned by the City or Municipal Highway Agency.