US Bridges

Clough Hill Road over Soucook River

Fair

Merrimack County, New Hampshire · 0.1 MI FR Nh 106 · Structure no. 015501350012700

Built
1960
65 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
66 ft
1 main span
Daily traffic
1,373
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Clough Hill Road over Soucook River is a steel stringer/multi-beam or girder carrying Clough Hill Road over Soucook River in Merrimack County, New Hampshire. It was built in 1960, so it is 65 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 5 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 1,373 vehicles a day, roughly 4% of them trucks, projected to reach 2,032 by 2043. The structure is 66 ft (20.1 m) long and 20 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesClough Hill Road
CrossesSoucook River
Location0.1 MI FR Nh 106
CountyMerrimack County
StateNew Hampshire
Coordinates43.34241, -71.46453
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length66 ft (20.1 m)
Longest span62 ft (18.9 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,373 (2023)
Projected traffic2,032 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 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 Hill Road over Soucook River built?

It was built in 1960, making it 65 years old in 2025.

What condition is Clough Hill Road over Soucook 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 September 2023.

How much traffic does Clough Hill Road over Soucook River carry?

About 1,373 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Clough Hill Road over Soucook River?

The structure is 66 ft (20.1 m) long with a longest span of 62 ft (18.9 m) and a deck 20 ft wide.

Who owns Clough Hill Road over Soucook River?

It is owned by the City or Municipal Highway Agency.