US Bridges

Potter Road over Grannis Brook

Fair

St. Lawrence County, New York · 0.75 MI W of Langdon Corn · Structure no. 000000003340690

Built
1964
61 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
39 ft
1 main span
Daily traffic
329
2018 count
Owner
County
County Highway Agency

About this bridge

Potter Road over Grannis Brook is a steel stringer/multi-beam or girder carrying Potter Road over Grannis Brook in St. Lawrence County, New York. It was built in 1964, so it is 61 years old, older 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 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 329 vehicles a day, roughly 2% of them trucks, projected to reach 461 by 2038. The structure is 39 ft (11.9 m) long and 27 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

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CarriesPotter Road
CrossesGrannis Brook
Location0.75 MI W of Langdon Corn
CountySt. Lawrence County
StateNew York
Coordinates44.58213, -75.0773
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating70 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length39 ft (11.9 m)
Longest span37 ft (11.2 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic329 (2018)
Projected traffic461 by 2038
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 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$565,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Potter Road over Grannis Brook built?

It was built in 1964, making it 61 years old in 2025.

What condition is Potter Road over Grannis 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 May 2023.

How much traffic does Potter Road over Grannis Brook carry?

About 329 vehicles per day (2018 count), of which roughly 2% are trucks.

How long is Potter Road over Grannis Brook?

The structure is 39 ft (11.9 m) long with a longest span of 37 ft (11.2 m) and a deck 27 ft wide.

Who owns Potter Road over Grannis Brook?

It is owned by the County Highway Agency.