US Bridges

Silver Hill Road over Plumb Brook

Fair

St. Lawrence County, New York · 2.2 MI SW of Degrasse · Structure no. 000000003221740

Built
1985
40 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
36 ft
1 main span
Daily traffic
3
2015 count
Owner
County
County Highway Agency

About this bridge

Silver Hill Road over Plumb Brook is a steel stringer/multi-beam or girder carrying Silver Hill Road over Plumb Brook in St. Lawrence County, New York. It was built in 1985, 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 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 3 vehicles a day, projected to reach 4 by 2035. The structure is 36 ft (11 m) long and 15 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesSilver Hill Road
CrossesPlumb Brook
Location2.2 MI SW of Degrasse
CountySt. Lawrence County
StateNew York
Coordinates44.34338, -75.10754
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; extensive scour has occurred
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckClosed grating
Main spans1
Design loadUnknown
Structure length36 ft (11 m)
Longest span35 ft (10.6 m)
Deck width15 ft (4.6 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3 (2015)
Projected traffic4 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$199,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Silver Hill Road over Plumb Brook built?

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

What condition is Silver Hill Road over Plumb 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 Silver Hill Road over Plumb Brook carry?

About 3 vehicles per day (2015 count).

How long is Silver Hill Road over Plumb Brook?

The structure is 36 ft (11 m) long with a longest span of 35 ft (10.6 m) and a deck 15 ft wide.

Who owns Silver Hill Road over Plumb Brook?

It is owned by the County Highway Agency.