US Bridges

Mccarthy Road over Plumb Brook

Poor

St. Lawrence County, New York · 2.3 MI W of Degrasse · Structure no. 000000003221730

Built
1985
40 years old, rebuilt 2005
Condition
Poor
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
32 ft
1 main span
Daily traffic
4
2015 count
Owner
County
County Highway Agency

About this bridge

Mccarthy Road over Plumb Brook is a steel stringer/multi-beam or girder carrying Mccarthy Road over Plumb Brook in St. Lawrence County, New York. It was built in 1985 and reconstructed in 2005, so it is 40 years old, younger than the New York average of 53 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 4 vehicles a day, projected to reach 6 by 2035. The structure is 32 ft (9.8 m) long and 15 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesMccarthy Road
CrossesPlumb Brook
Location2.3 MI W of Degrasse
CountySt. Lawrence County
StateNew York
Coordinates44.34766, -75.11019
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment2: Basically intolerable, requiring high priority of replacement
Operating rating105.1 US tons
Inventory rating63.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckOpen grating
Main spans1
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width15 ft (4.6 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4 (2015)
Projected traffic6 by 2035
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$343,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mccarthy Road over Plumb Brook built?

It was built in 1985, making it 40 years old in 2025. It was reconstructed in 2005.

What condition is Mccarthy Road over Plumb Brook in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2023.

How much traffic does Mccarthy Road over Plumb Brook carry?

About 4 vehicles per day (2015 count).

How long is Mccarthy Road over Plumb Brook?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 15 ft wide.

Who owns Mccarthy Road over Plumb Brook?

It is owned by the County Highway Agency.