US Bridges

Nh 28 over Suncook River

Good

Merrimack County, New Hampshire · At Pembroke Tl · Structure no. 000401070009800

Built
1958
67 years old, rebuilt 2024
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
218 ft
3 main spans
Daily traffic
7,989
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 28 over Suncook River is a steel continuous stringer/multi-beam or girder carrying Nh 28 over Suncook River in Merrimack County, New Hampshire. It was built in 1958 and reconstructed in 2024, so it is 67 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 7,989 vehicles a day, roughly 7% of them trucks, projected to reach 11,823 by 2043. The structure is 218 ft (66.3 m) long and 43 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesNh 28
CrossesSuncook River
LocationAt Pembroke Tl
RouteState Highway 28
CountyMerrimack County
StateNew Hampshire
Coordinates43.15984, -71.40593
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than 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 rating74.7 US tons
Inventory rating57.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, precast panels
Main spans3
Design loadHL 93
Structure length218 ft (66.3 m)
Longest span80 ft (24.4 m)
Deck width43 ft (13 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,989 (2023)
Projected traffic11,823 by 2043
Trucks7%
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

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 1958, making it 67 years old in 2025. It was reconstructed in 2024.

What condition is Nh 28 over Suncook 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 April 2024.

How much traffic does Nh 28 over Suncook River carry?

About 7,989 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 28 over Suncook River?

The structure is 218 ft (66.3 m) long with a longest span of 80 ft (24.4 m) and a deck 43 ft wide.

Who owns Nh 28 over Suncook River?

It is owned by the State Highway Agency.