US Bridges

Grove Street over Nubanusit Brook

Fair

Hillsborough County, New Hampshire · 0.4 MI FR Nh RTE 123 · Structure no. 020800870008700

Built
1936
89 years old
Condition
Fair
inspected July 2023
Type
Frame
Concrete
Length
54 ft
1 main span
Daily traffic
7,812
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Grove Street over Nubanusit Brook is a concrete frame carrying Grove Street over Nubanusit Brook in Hillsborough County, New Hampshire. It was built in 1936, so it is 89 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 7,812 vehicles a day, roughly 4% of them trucks, projected to reach 11,561 by 2043. The structure is 54 ft (16.5 m) long and 47 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesGrove Street
CrossesNubanusit Brook
Location0.4 MI FR Nh RTE 123
Coordinates42.87603, -71.95094
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be 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 alignment6: Equal to present minimum criteria
Operating rating38.3 US tons
Inventory rating19.1 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length54 ft (16.5 m)
Longest span47 ft (14.3 m)
Deck width47 ft (14.3 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,812 (2023)
Projected traffic11,561 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 Grove Street over Nubanusit Brook built?

It was built in 1936, making it 89 years old in 2025.

What condition is Grove Street over Nubanusit Brook in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2023.

How much traffic does Grove Street over Nubanusit Brook carry?

About 7,812 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Grove Street over Nubanusit Brook?

The structure is 54 ft (16.5 m) long with a longest span of 47 ft (14.3 m) and a deck 47 ft wide.

Who owns Grove Street over Nubanusit Brook?

It is owned by the City or Municipal Highway Agency.