US Bridges

Knowlton Street over Minnewawa Brook

Fair

Cheshire County, New Hampshire · 60 Ft FR Nh RTE 101 · Structure no. 016300600013500

Built
1943
82 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
44 ft
1 main span
Daily traffic
110
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Knowlton Street over Minnewawa Brook is a steel stringer/multi-beam or girder carrying Knowlton Street over Minnewawa Brook in Cheshire County, New Hampshire. It was built in 1943, so it is 82 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 110 vehicles a day, projected to reach 162 by 2043. The structure is 44 ft (13.4 m) long and 15 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesKnowlton Street
CrossesMinnewawa Brook
Location60 Ft FR Nh RTE 101
CountyCheshire County
StateNew Hampshire
Coordinates42.91008, -72.21914
Functional classUrban 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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating25.2 US tons
Inventory rating18.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length44 ft (13.4 m)
Longest span40 ft (12.2 m)
Deck width15 ft (4.6 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2023)
Projected traffic162 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Knowlton Street over Minnewawa Brook built?

It was built in 1943, making it 82 years old in 2025.

What condition is Knowlton Street over Minnewawa 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 Knowlton Street over Minnewawa Brook carry?

About 110 vehicles per day (2023 count).

How long is Knowlton Street over Minnewawa Brook?

The structure is 44 ft (13.4 m) long with a longest span of 40 ft (12.2 m) and a deck 15 ft wide.

Who owns Knowlton Street over Minnewawa Brook?

It is owned by the City or Municipal Highway Agency.