US Bridges

Nh 28 over Suncook River

Fair

Belknap County, New Hampshire · 3.6 MI from Pittsfield Tl · Structure no. 001401310010800

Built
1957
68 years old, rebuilt 2020
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
64 ft
1 main span
Daily traffic
8,548
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 28 over Suncook River is a steel stringer/multi-beam or girder carrying Nh 28 over Suncook River in Belknap County, New Hampshire. It was built in 1957 and reconstructed in 2020, so it is 68 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 8,548 vehicles a day, roughly 7% of them trucks, projected to reach 12,651 by 2043. The structure is 64 ft (19.5 m) long and 44 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesNh 28
CrossesSuncook River
Location3.6 MI from Pittsfield Tl
RouteState Highway 28
CountyBelknap County
StateNew Hampshire
Coordinates43.35528, -71.26016
Functional classRural Minor Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length64 ft (19.5 m)
Longest span60 ft (18.3 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,548 (2023)
Projected traffic12,651 by 2043
Trucks7%
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 Nh 28 over Suncook River built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 2020.

What condition is Nh 28 over Suncook River 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 May 2024.

How much traffic does Nh 28 over Suncook River carry?

About 8,548 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 28 over Suncook River?

The structure is 64 ft (19.5 m) long with a longest span of 60 ft (18.3 m) and a deck 44 ft wide.

Who owns Nh 28 over Suncook River?

It is owned by the State Highway Agency.