US Bridges

Union Street over Nubanusit Brook

Good

Hillsborough County, New Hampshire · 0.6 MI from Nh RTE 101 · Structure no. 020800570010800

Built
1937
88 years old, rebuilt 2017
Condition
Good
inspected July 2023
Type
Frame
Concrete
Length
73 ft
1 main span
Daily traffic
1,369
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Union Street over Nubanusit Brook is a concrete frame carrying Union Street over Nubanusit Brook in Hillsborough County, New Hampshire. It was built in 1937 and reconstructed in 2017, so it is 88 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 1,369 vehicles a day, roughly 4% of them trucks, projected to reach 2,026 by 2043. The structure is 73 ft (22.3 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesUnion Street
CrossesNubanusit Brook
Location0.6 MI from Nh RTE 101
CountyHillsborough County
StateNew Hampshire
Coordinates42.88688, -71.98448
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating41.2 US tons
Inventory rating24.7 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length73 ft (22.3 m)
Longest span65 ft (19.8 m)
Deck width35 ft (10.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,369 (2023)
Projected traffic2,026 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 Union Street over Nubanusit Brook built?

It was built in 1937, making it 88 years old in 2025. It was reconstructed in 2017.

What condition is Union Street over Nubanusit 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 2023.

How much traffic does Union Street over Nubanusit Brook carry?

About 1,369 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Union Street over Nubanusit Brook?

The structure is 73 ft (22.3 m) long with a longest span of 65 ft (19.8 m) and a deck 35 ft wide.

Who owns Union Street over Nubanusit Brook?

It is owned by the City or Municipal Highway Agency.