US Bridges

North Wilmot Road over Kimpton Brook

Fair

Merrimack County, New Hampshire · 0.04MI NH4A · Structure no. 027501460010000

Built
1968
57 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Prestressed Concrete Continuous
Length
33 ft
1 main span
Daily traffic
378
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

North Wilmot Road over Kimpton Brook is a prestressed concrete continuous tee beam carrying North Wilmot Road over Kimpton Brook in Merrimack County, New Hampshire. It was built in 1968, so it is 57 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 378 vehicles a day, roughly 4% of them trucks, projected to reach 559 by 2043. The structure is 33 ft (10.1 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesNorth Wilmot Road
CrossesKimpton Brook
Location0.04MI NH4A
CountyMerrimack County
StateNew Hampshire
Coordinates43.45144, -71.91285
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.1 US tons
Inventory rating26.5 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span25 ft (7.6 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic378 (2023)
Projected traffic559 by 2043
Trucks4%
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

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 North Wilmot Road over Kimpton Brook built?

It was built in 1968, making it 57 years old in 2025.

What condition is North Wilmot Road over Kimpton Brook 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 2024.

How much traffic does North Wilmot Road over Kimpton Brook carry?

About 378 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is North Wilmot Road over Kimpton Brook?

The structure is 33 ft (10.1 m) long with a longest span of 25 ft (7.6 m) and a deck 24 ft wide.

Who owns North Wilmot Road over Kimpton Brook?

It is owned by the City or Municipal Highway Agency.