US Bridges

NH121 over Sucker Brook

Good

Rockingham County, New Hampshire · 2.5 MI from Manchester Tl · Structure no. 001300970012400

Built
1930
95 years old, rebuilt 1992
Condition
Good
inspected August 2024
Type
Frame
Concrete
Length
35 ft
1 main span
Daily traffic
2,682
2023 count
Owner
State
State Highway Agency

About this bridge

NH121 over Sucker Brook is a concrete frame carrying NH121 over Sucker Brook in Rockingham County, New Hampshire. It was built in 1930 and reconstructed in 1992, so it is 95 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 2,682 vehicles a day, roughly 5% of them trucks, projected to reach 3,969 by 2043. The structure is 35 ft (10.7 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNH121
CrossesSucker Brook
Location2.5 MI from Manchester Tl
RouteState Highway 121
CountyRockingham County
StateNew Hampshire
Coordinates43.00435, -71.34886
Functional classRural Major Collector

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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating42.5 US tons
Inventory rating25.6 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length35 ft (10.7 m)
Longest span30 ft (9.1 m)
Deck width30 ft (9.1 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,682 (2023)
Projected traffic3,969 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 NH121 over Sucker Brook built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1992.

What condition is NH121 over Sucker 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 August 2024.

How much traffic does NH121 over Sucker Brook carry?

About 2,682 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is NH121 over Sucker Brook?

The structure is 35 ft (10.7 m) long with a longest span of 30 ft (9.1 m) and a deck 30 ft wide.

Who owns NH121 over Sucker Brook?

It is owned by the State Highway Agency.