US Bridges

Patterson Road over Kimpton Brook

Fair

Merrimack County, New Hampshire · 100 Yds N Rt 4A · Structure no. 027501500011200

Built
1994
31 years old
Condition
Fair
inspected August 2024
Type
Culvert
Steel
Length
35 ft
2 main spans
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Patterson Road over Kimpton Brook is a steel culvert carrying Patterson Road over Kimpton Brook in Merrimack County, New Hampshire. It was built in 1994, so it is 31 years old, younger 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 96 vehicles a day, projected to reach 142 by 2043. The structure is 35 ft (10.7 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesPatterson Road
CrossesKimpton Brook
Location100 Yds N Rt 4A
CountyMerrimack County
StateNew Hampshire
Coordinates43.44916, -71.90307
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating58 US tons
Inventory rating34 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length35 ft (10.7 m)
Longest span16 ft (4.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96 (2023)
Projected traffic142 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
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 Patterson Road over Kimpton Brook built?

It was built in 1994, making it 31 years old in 2025.

What condition is Patterson 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 Patterson Road over Kimpton Brook carry?

About 96 vehicles per day (2023 count).

How long is Patterson Road over Kimpton Brook?

The structure is 35 ft (10.7 m) long with a longest span of 16 ft (4.9 m).

Who owns Patterson Road over Kimpton Brook?

It is owned by the City or Municipal Highway Agency.