US Bridges

RTE 812 over Black River

Fair

Lewis County, New York · 3.6 MI N JCT Rts 12 & 812 · Structure no. 000000001018960

Built
1993
32 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
328 ft
3 main spans
Daily traffic
4,284
2016 count
Owner
State
State Highway Agency

About this bridge

RTE 812 over Black River is a steel stringer/multi-beam or girder carrying RTE 812 over Black River in Lewis County, New York. It was built in 1993, so it is 32 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 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 4,284 vehicles a day, roughly 8% of them trucks, projected to reach 4,324 by 2041. The structure is 328 ft (100 m) long and 46 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesRTE 812
CrossesBlack River
Location3.6 MI N JCT Rts 12 & 812
RouteState Highway 812
Coordinates43.82292, -75.46293
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.1 US tons
Inventory rating37 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length328 ft (100 m)
Longest span130 ft (39.6 m)
Deck width46 ft (14 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,284 (2016)
Projected traffic4,324 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$5 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 812 over Black River built?

It was built in 1993, making it 32 years old in 2025.

What condition is RTE 812 over Black 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 August 2024.

How much traffic does RTE 812 over Black River carry?

About 4,284 vehicles per day (2016 count), of which roughly 8% are trucks.

How long is RTE 812 over Black River?

The structure is 328 ft (100 m) long with a longest span of 130 ft (39.6 m) and a deck 46 ft wide.

Who owns RTE 812 over Black River?

It is owned by the State Highway Agency.