US Bridges

Clough Park Road over Piscataquog River

Fair

Hillsborough County, New Hampshire · 1.0 MI S Dunbarton Tl · Structure no. 026701670009800

Built
1962
63 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
94 ft
2 main spans
Daily traffic
545
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Clough Park Road over Piscataquog River is a steel continuous stringer/multi-beam or girder carrying Clough Park Road over Piscataquog River in Hillsborough County, New Hampshire. It was built in 1962, so it is 63 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 545 vehicles a day, roughly 4% of them trucks, projected to reach 806 by 2043. The structure is 94 ft (28.7 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesClough Park Road
CrossesPiscataquog River
Location1.0 MI S Dunbarton Tl
RouteState Highway 0
CountyHillsborough County
StateNew Hampshire
Coordinates43.08436, -71.65748
Functional classRural Minor Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating49.1 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length94 ft (28.7 m)
Longest span45 ft (13.7 m)
Deck width32 ft (9.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic545 (2023)
Projected traffic806 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.8 mi (11 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 Clough Park Road over Piscataquog River built?

It was built in 1962, making it 63 years old in 2025.

What condition is Clough Park Road over Piscataquog 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 August 2023.

How much traffic does Clough Park Road over Piscataquog River carry?

About 545 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Clough Park Road over Piscataquog River?

The structure is 94 ft (28.7 m) long with a longest span of 45 ft (13.7 m) and a deck 32 ft wide.

Who owns Clough Park Road over Piscataquog River?

It is owned by the City or Municipal Highway Agency.