Great Lakes - St. Lawrence River
Lake Ontario
North Lake Ontario
[2022]Area Attrib LCC2EA convert.[2019]New lake unit introduced.

Great Lakes - St. Lawrence River
Lake Ontario
West Lake Ontario
[2022]Area Attrib LCC2EA convert.[2021]Geometry repaired.[2019]New lake unit introduced.

Great Lakes - St. Lawrence River
Lake Ontario
West Lake Ontario Shoreline
[2022]Area Attrib LCC2EA convert.[2019]New unit introduced.

North Lake Ontario Shoreline
[2022]Area Attrib LCC2EA convert.[2019]New unit introduced.

North Lake Ontario Shoreline
St. Marys Cement Quarry Sink
[2022]Area Attrib LCC2EA convert.[2019]New unit introduced.

Northern Lake Ontario and Niagara River
Humber River - Don River
Duffins Creek
[2022]Area Attrib LCC2EA convert.[2020]Secondary watershed name update (OWB principles).[2019]New unit introduced.

Northern Lake Ontario and Niagara River
Humber River - Don River
Don River
[2022]Area Attrib LCC2EA convert.[2020]Secondary watershed name update (OWB principles).[2019]New unit introduced.

West Lake Ontario Shoreline
Highland Creek

Northern Lake Ontario and Niagara River
Humber River - Don River
East Humber River
[2022]Area Attrib LCC2EA convert.[2020]Secondary watershed name update (OWB principles).[2019]New unit introduced.

Northeast Lake Ontario
[2022]Area Attrib LCC2EA convert.[2019]New lake unit introduced.

North Lake Ontario Shoreline
Gage Creek

Colborne Creek

Northeast Lake Ontario Shoreline
Wellers Bay
Consecon Mill Dam - Wellers Bay

Northeast Lake Ontario Shoreline

Cobourg Brook

Shelter Valley Creek

Rouge River

Eastern Georgian Bay
Severn River - Lake Simcoe
Holland River East Branch

Eastern Georgian Bay
Severn River - Lake Simcoe
Holland River

Eastern Georgian Bay
Severn River - Lake Simcoe
Black River

Lake Simcoe

Lake Simcoe
Bluffs Creek

Lake Huron
South Georgian Bay Shoreline
Sturgeon River

Lake Huron
South Georgian Bay Shoreline
Matchedash Bay
[2023]Reassigned from tertiary 02ED to 023C.[2022]Area Attrib LCC2EA convert.[2019]New unit introduced.

Lake Huron
South Georgian Bay Shoreline

Sparrow Lake - Severn River

Little Lake - Severn River

Kahshe River

McCrae Lake

Muskoka River
Musquash River

Muskoka River
Lake Muskoka - Muskoka River

Tadenac Lake - Tadenac Bay

Muskoka River
Moon River Bay

Second Marsh - Harmony Creek

West Lake Ontario Shoreline
Lynde Creek

Graham Creek

Oshawa Harbour - Oshawa Creek

Bowmanville Creek

Wilmot Creek

Ganaraska River

Otonabee River
Cavan Creek

Scugog River
Nonquon River

Trent River - Crowe River
Cold Creek

Northeast Lake Ontario Shoreline
Telegraph Narrows - Bay of Quinte
[2022]Area Attrib LCC2EA convert.[2019]New unit geometry approved through IJC Task Force. Coding changed to be consistent with current provincial coding hierarchy.

Trent River - Crowe River
Percy Creek

Otonabee River
Hastings Lock 18 Dam - Trent River

Trent River - Crowe River
Mayhew Creek - Trent River Outlet

Scugog River
Lake Scugog - Scugog River

Kawartha Lakes
Omemee Dam - Pigeon River

Otonabee River
Otonabee River Outlet

Pefferlaw River

Scugog River
East Cross Creek

Beaver River

Mariposa Brook

Lake Simcoe
White's Creek

Crowe Bay Dam - Trent River

Indian River

Ouse River

Kawartha Lakes
Pigeon Lake - Gannon Narrows

Gull River
Cameron Lake Dam - Fenelon River

Talbot River - Trent-Severn Waterway

Kawartha Lakes
Nogies Creek

Head River

Gull River
Goose Lake - Burnt River

Lake St. John - Black River

Gull River
Coboconk Dam - Gull River

Birchbark Lake - Irondale River

Mississagua River

Eels Creek

Chandos Lake - Crowe River

Paudash Lake Dam - Crowe River

Central Ottawa River
Mississippi River - Central Ottawa River
Lower Mazinaw Lake - Mississippi River

Farquhar Lake - Irondale River
[2022]Area Attrib LCC2EA convert.[2021]Quaternary Name Update.[2020]Secondary watershed name update (OWB principles).[2019]New unit introduced.

Central Ottawa River
Upper Madawaska River
Egan Creek

Central Ottawa River
Upper Madawaska River
Little Mississippi River

Upper Madawaska River
Halfmoon Bay - York River

Lower Madawaska River
Black Donald Lake - Madawaska River

Baptiste Lake - York River

Three Brothers Falls - Burnt River

Anson Creek

Drag River

Minden Dam - Gull River

South Branch Muskoka River Outlet

Cache Creek - Black River

Pine Lake - Gull River
[2022]Area Attrib LCC2EA convert.[2021]Quaternary Code Update.[2020]Secondary watershed name update (OWB principles).[2019]New unit introduced.

Buttermilk Falls - Halls Lake

Redstone River

Baysville Narrows - South Branch Muskoka River

South Georgian Bay
[2022]Area Attrib LCC2EA convert.[2021]Geometry repaired.[2019]New lake unit introduced.

North Georgian Bay
[2022]Area Attrib LCC2EA convert.[2021]Geometry repaired.[2019]New lake unit introduced.

Spider Bay

Boyne River

[2022]Area Attrib LCC2EA convert.[2021]Geometry repaired.[2019]New unit introduced.

North Georgian Bay Shoreline

Portage Lake

North Georgian Bay Shoreline
Shebeshekong River

Blair Creek

Magnetawan River
Shawanaga River

North Branch Muskoka River

Lake Rosseau

Blackstone Harbour

Magnetawan River
Seguin River

Lake Vernon

Magnetawan River
Manitouwabing Lake

Burk's Falls Dam - Magnetawan River

Poverty Bay Chutes - Magnetawan River

Wahwashkesh Dam - Magnetawan River

Stirling Creek

North Georgian Bay Shoreline
Brignall Banks Narrows

Naiscoot River

Giroux River

Magnetawan River Outlet

Still River

Henvey Inlet

Magnetawan Locks - Magnetawan River

North Magnetawan River

Ferrie River

Wanipitai River and French River
French River
Wauquimakog Lake - Pickerel River

Wanipitai River and French River
French River
Restoule River

Wanipitai River and French River
French River
Bray Lake - South River

Lake Nipissing
Bear Creek

Lake Nipissing
Shoal Creek

Lake Nipissing
Boulder Creek

La Vase River

Allen Lake - French River

Key River

Dollars Lake - Pickerel River

Cantin Lake - Pickerel River

Recollet Falls - French River

Chaudière Dam - French River

West Bay - Lake Nippissing
Number One Creek

West Bay - Lake Nippissing

Upper Ottawa River
Kipawa River - Upper Ottawa River
Turtle Lake - Mattawa River

Chippewa Creek

Lower Madawaska River
Highland Falls - Madawaska River

Racket Rapids - Madawaska River

Papineau Creek

Lower Madawaska River
Constant Creek

Galeairy Lake - Madawaska River

Rockingham Creek

Kamaniskeg Lake - Madawaska River

Bonnechere River - Central Ottawa River
Douglas Dam - Bonnechere River

Hollow River

Oxtongue River Outlet

Little East River - Big East River

Rock Lake Dam - Madawaska River

Distress Pond - Big East River

Tea Lake - Oxtongue River

Whitefish Lake - Madawaska River

Ayers Lake Dam - Magnetawan River

Opeongo Lake

Petawawa River
Big Trout Lake - Petawawa River

Bonnechere River - Central Ottawa River
Brennans Creek

Bonnechere River - Central Ottawa River
Sherwood River

Golden Lake Dam - Bonnechere River

Snake River

Opeongo River

Aylen River

Round Lake - Bonnechere River

Muskrat River

Couchain Lake - Bonnechere River

Île aux Alumettes - Ottawa River
[2022]Area Attrib LCC2EA convert.[2021]Geometry repaired.[2020]Secondary watershed name update (OWB principles).[2019]Ottawa River - CA-ON Jurisdiction

Île aux Alumettes - Ottawa River

Île aux Alumettes - Ottawa River
[2022]Area Attrib LCC2EA convert.[2021]Geometry repaired.[2020]Secondary watershed name update (OWB principles).[2019]Ottawa River - CA-QC Jurisdiction

[2022]Area Attrib LCC2EA convert.[2020]Secondary watershed name update (OWB principles).[2019]New unit introduced (conceptual)

Petawawa River
Grand Lake Dam - Barron River

Petawawa River
Black Bay - Barron River

Dumoine - Central Ottawa River
Petawawa Point - Ottawa River

Veuve River

Sturgeon River
Muskosung Lake - Sturgeon River

Tim River

Crow River

Catfish Lake - Petawawa River

Nipissing River

South River Dam - South River

Radiant Lake - Petawawa River

Upper Ottawa River
Kipawa River - Upper Ottawa River
Manitou Lake - Amable du Fond River

Upper Ottawa River
Kipawa River - Upper Ottawa River
Kioshkokwi Lake - Amable du Fond River

Cauchon Creek

North River

Lake Travers Dam - Petawawa River

Black Bay - Petawawa River

Dumoine - Central Ottawa River
Petawawa Point - Ottawa River
[2022]Area Attrib LCC2EA convert.[2021]Geometry repaired.[2020]Secondary watershed name update (OWB principles).[2019]Ottawa River - CA-ON Jurisdiction

Dumoine - Central Ottawa River
Chalk River

Petawawa Point - Ottawa River
[2022]Area Attrib LCC2EA convert.[2021]Geometry repaired.[2020]Secondary watershed name update (OWB principles).[2019]Ottawa River - CA-QC Jurisdiction

Bissett Creek

Holden Lake - Ottawa River

Wasi River

Smith Lake - Amable du Fond River

Pautois Creek

Deux-Rivières Creek - Ottawa River

Talon Lake Dam - Mattawa River

Chant Plain Lake - Mattawa River

Deux-Rivières Creek - Ottawa River
[2022]Area Attrib LCC2EA convert.[2021]Geometry repaired.[2020]Secondary watershed name update (OWB principles).[2019]Ottawa River - CA-ON Jurisdiction

Deux-Rivières Creek - Ottawa River
[2022]Area Attrib LCC2EA convert.[2021]Geometry repaired.[2020]Secondary watershed name update (OWB principles).[2019]Ottawa River - CA-QC Jurisdiction

Mattawa River - Ottawa River

Antoine Creek