US Bridges

RTE 812 over Oswegatchie River

Fair

St. Lawrence County, New York · 5.72MI N Int I87 + US 11 · Structure no. 000000001032790

Built
1977
48 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
281 ft
2 main spans
Daily traffic
1,784
2020 count
Owner
State
State Highway Agency

About this bridge

RTE 812 over Oswegatchie River is a steel continuous stringer/multi-beam or girder carrying RTE 812 over Oswegatchie River in St. Lawrence County, New York. It was built in 1977, so it is 48 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 1,784 vehicles a day, roughly 11% of them trucks, projected to reach 1,800 by 2041. The structure is 281 ft (85.6 m) long and 46 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

Open in Google Maps
CarriesRTE 812
CrossesOswegatchie River
Location5.72MI N Int I87 + US 11
RouteState Highway 812
CountySt. Lawrence County
StateNew York
Coordinates44.54558, -75.34147
Functional classRural Principal Arterial - Other

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry8: Equal to present desirable criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment9: Superior to present desirable criteria
Operating rating110.1 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length281 ft (85.6 m)
Longest span138 ft (42 m)
Deck width46 ft (14 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,784 (2020)
Projected traffic1,800 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed7.5 mi (12 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$4.6 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 812 over Oswegatchie River built?

It was built in 1977, making it 48 years old in 2025.

What condition is RTE 812 over Oswegatchie River 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 2024.

How much traffic does RTE 812 over Oswegatchie River carry?

About 1,784 vehicles per day (2020 count), of which roughly 11% are trucks.

How long is RTE 812 over Oswegatchie River?

The structure is 281 ft (85.6 m) long with a longest span of 138 ft (42 m) and a deck 46 ft wide.

Who owns RTE 812 over Oswegatchie River?

It is owned by the State Highway Agency.