US Bridges

RTE 812 over Oswegatchie River

Good

St. Lawrence County, New York · 151FT NW of 184 812 Int. · Structure no. 000000001032800

Built
2010
15 years old
Condition
Good
inspected July 2023
Type
Arch - Deck
Concrete
Length
224 ft
3 main spans
Daily traffic
3,099
2020 count
Owner
State
State Highway Agency

About this bridge

RTE 812 over Oswegatchie River is a concrete arch - deck carrying RTE 812 over Oswegatchie River in St. Lawrence County, New York. It was built in 2010, so it is 15 years old, younger than the New York average of 53 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,099 vehicles a day, roughly 10% of them trucks, projected to reach 3,128 by 2041. The structure is 224 ft (68.3 m) long and 47 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

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CarriesRTE 812
CrossesOswegatchie River
Location151FT NW of 184 812 Int.
RouteState Highway 812
CountySt. Lawrence County
StateNew York
Coordinates44.61671, -75.40504
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating96.8 US tons
Inventory rating45 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 25 or greater
Structure length224 ft (68.3 m)
Longest span70 ft (21.3 m)
Deck width47 ft (14.4 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,099 (2020)
Projected traffic3,128 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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$9.1 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 812 over Oswegatchie River built?

It was built in 2010, making it 15 years old in 2025.

What condition is RTE 812 over Oswegatchie River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does RTE 812 over Oswegatchie River carry?

About 3,099 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is RTE 812 over Oswegatchie River?

The structure is 224 ft (68.3 m) long with a longest span of 70 ft (21.3 m) and a deck 47 ft wide.

Who owns RTE 812 over Oswegatchie River?

It is owned by the State Highway Agency.